The whistle sounds and a great result for Chelsea in a game that was far from a classic. The highlight no doubt the fine overhead strike from Giroud. 

Into the final minute of the added time and Atleti will need a big result in South West London on 17 March.

Lemar carded as he fouls Pulisic

Urgency now for the home side with 0 shots on goal from Simeone's men in a night to forget for Colchoneros fans

The numerous subs and VAR delay for the Chelsea goal constitue that added time.

Six minutes of time to be added

Atleti travel to Villarreal at the weekend and face a tricky test against Unai Emery's side. 

Pulisic and Havertz on with Giroud and Werner off

Five minutes for Atleti to find an equaliser, it really has been a poor display from the LaLiga men tonight.

Joao Felix alos off for Atleti as Vitolo comes on for Hermoso

Werner goes close but rifles the ball into the side netting

Off for ATM: Correa, Saul

Three changes for Atleti... Lodi, Torreira and Dembele all on

Possession: 39% ATM/61% CFC

James on for Hudson-Odoi

Atleti ten minutes off from completing a hat-trick of first leg defeats for the LaLiga sides in the Champions League after Barcelona and Sevilla losing last week.

Rudiger and Suarez involved in cross words with frustration setting in for the Spanish side now.  

Still 1-4 in Rome with Bayern very much in command in the other tie

Less than 15' remain in Bucharest and Atleti now need to amend their game-plan.

Changes for Chelsea:  Kovacic and Mount off / Kante and Ziyech on

Eight in a row for Atleti now conceding goals.... new territory for the Spanish side

The ball came off Hermoso on its way to Giroud.

Wonderful effort from the striker....

The goal stands!!!!!!!! One nil Chelsea... Giroud the scorer

VAR still checking .....

VAR alos being consulted but it appeared that the forward was offside

A fine acrobatic effort from the veteran forward... a let-off for Atleti.

The flag is up as the French striker struck the ball

Lodi set to enter the action

Atleti poised to make a change ....

Still 0-2 for shots on target (ATM-CFC). Zero shots on target in the second half.

The central player will also miss the second leg on 17 March. Simeone has also been handed a card. 

Jorginho carded as he clips Joao Felix

One senses that Atleti and Simeone would not be disappointed with a 0-0 final score-line.

Llorente carded for a pull on Werner.

Over the hour mark and still no sign of the opening goal.

Saul sees Mendy off his line and tries from long range. Game getting tetchy now with niggly fouls a plenty.

Joao Felix looks for the spectacular but his scissor kick goes high and wide

Suarez wins a corner ... poor delivery from Angel Correa

Savic in defensive duty in tonight's game

Werner drives in a decent ball into the Atleti box but Felipe clears the danger.

Mendy makes a mess of a back pass and coincedes a cheap throw-in for Atleti.

Corner for "The Blues" ...Mount to take, goes short and Atleti clear the danger.

A goal fest in Rome where it's now Lazio 1-4 Bayern.

Suarez goes to ground again as Hudson-Odoi knees the Uruguayan in the back.

Werner breaks and gives the ball away cheaply but Hudson-Odoi on hand to block the clearance.

Luis Suarez fouled and looks a little concerned. Far from a vintage half from the LaLiga leaders as the Uruguayan wins a corner.

Teams are back on the pitch and it's the home side (Atleti) who get the action underway

The whistle sounds after a cagey half... Chelsea with the better of the half chances in a real game of chess. One for the tacticians !

Good work from Chelsea as Hudson Odoi and Mount work a one-two and win a corner with just one minute of time to be added.

Oblak has been the busier of the keepers with Atleti yet to register a shot on target... Chelsea have had 2.

Less than five minutes remain and it's been a disappointing half from Atleti. We've seen two defeats from two in the Round of 16 games with both Barcelona and Sevilla losing last week. A depleted Real Madrid side face Atalanta tomorrow night in Bergamo.

Christensen clips Suarez and the striker yells in pain. No card from the German match official. 

Werner tests Oblak but the Slovenian stopper stands tall and palms the ball away from the danger zone
 

Musiala has put Bayern 0-2 ahead in Rome (vs Lazio)

A pensive looking Diego Simeone on the Atleti bench inside Bucharest's National Stadium

Lemar tries to dink the ball through to Suarez but, as been the case from both sides, the final ball is overhit

Chelsea subs warming up on the sideline with less than 15 remaining in the first half.  

We've seen little action from Felix or Suarez this evening after half an hour of action.

Chelsea's passing is crisp and accurate in the centre of the field but it's just in the final third where they are unable to find that final ball to unlock the red and white defensive wall.

Fine cross from Alonso and Giroud sees his diving header blocked by the men in red and white.  Chelsea playing the bulk of the football with Atleti sucking up the pressure.

Alonso tries a long range shot but easy for Oblak to gather.

Chelsea just unable to find the right weight with the final ball. Atleti sitting deep and look to strike on the break.

The Premier League side enjoying the bulk of possession after the first twenty minutes of action

Werner takes a knock to his elbow as he wins his side another corner.

Coming up to the 20 minute mark and it's Chelsea that are enjoying the better of the action.

Now Chelsea go close at the other end as Werner fails to get purchase on a dangerous ball that fizzes across the face of Oblak's box.

Close for Atleti as Suarez drives the ball across the face of goal and Lemart just unable to latch onto the lose ball

Christensen has a go from long range but fails to secure direction as he drives high and wide.

Bayern have gone ahead in Rome with Lewandowski putting the German side ahead in the 9th minute.

Atleti press as Joao Felix dinks the ball into the box and Alonso is on hand to nod behind.

Rudiger clashes into a free flowing Llorente and the German match official halts the action.

All eleven Atleti men behind the ball as Chelsea press and look for a way through the red and white wall. Chelsea win the first corner of the evening.

Chelsea enjoying a spell of possession as Llorente is forced to clear for Atleti as the Spanish side sit deep.

Stop-start element to the game in the opening phase with limited flow to the action

Simeone clad in traditional black attire on the bench tonight as Mount is carded and will miss the return leg

Wednesday 17 will see the return leg of the tie at Stamford Bridge. All set in Bucharest with the Premier League side getting the action underway. 

The sides take to the field. Atleti in their classic red and white stripes, red shorts with Chelsea in their all sky blue kit

Tonight's referee is German Felix Brych.

The other Champions League Round of 16 action tonight takes place in Rome as Lazio welcome Bayern Munich. We'll bring you key updates from that game here too via our feed. 

The key absentee for Chelsea tonight is centre-back Thiago Silva, who didn’t play against Southampton due to a muscular issue. Atleti are without Herrera (covid), José María Giménez (muscular) and Yannick Carrasco has also failed to make the trip due to injury.

Chelsea have played 11 two-legged knockout ties with Spanish teams, with just four wins, while they have won just two of their last 11 away knockout fixtures against La Liga clubs in UEFA competition.

Chelsea are looking revived under new manager Tuchel and last weekend's draw away to Southampton was the only minor blot on their copybook over the past five games.

Atletico, despite still being LaLiga leaders have wobbled of late and have been uncharacteristically leaky defensively of late. Their comfortable lead at the top of the table was reduced considerable with an away draw and home defeat to Levante UD last week .

The National Stadium in Bucharest, setting for tonight's action

Chelsea come into tonight's clash unbeaten in seven matches in all competitions since Tuchel was named as manager to replace club great Frank Lampard, but he said the Londoners will have to be at their best against Diego Simeone's battling side.

"It's a big test. They're an experienced club at this level, (have) an experienced coach. Hopefully it brings out the best in us," Tuchel told a news conference.

"We'll do things our way, they'll do things their way. It's clear what you get when you play Atletico - fighting, experience, a team with a good mentality."

This is what Diego Simeone (Atleti manager) had to say about his striker pre game

All eyes will be on Luis Suarez tonight and the Uruguayan player has never failed to score or deliver an assist in a Champions League season – this is his eighth campaign in the tournament. The striker has not scored or laid a goal on in his four Champions League games for Atleti. 

Atleti have reached the knockout stages of the Champions League for the seventh time in the last eight seasons. Chelsea will attempt to progress past the round of 16 for the first time since the 2013-14 campaign, when they lost to Diego Simeone's men in the semi-finals.

The Chelsea XI just confirmed: 

Team news, first up the Atleti XI for tonight's Round of 16 clash: 

Tonight's game (taking place incidentally in Bucharest due to covid restrictions in Spain relating to UK visitors) starts at 21:00 CET in the National Stadium in the Romanian capital. 

Hello and a warm welcome to our Champions League Round of 16 coverage as Atletico Madrid face Chelsea.