Valencia were left appealing for a penalty after a possible handball by midfielder Ivan Rakitic early on in Barcelona's 4-2 LaLiga win at the Camp Nou.
In the eighth minute, Fabián Orellana headed a far-post cross back towards the centre of the area, only for the ball to bounce off Rakitic - with replays unable to fully clarify whether it hit the Croat's arm or only his stomach.
Neymar shout turned down, foul on Suárez given
Referee Alejandro José Hernández Hernández waved away Los Che's calls for a spot-kick, doing likewise to Barça a quarter of an hour later when Neymar went down under Ezequiel Garay's challenge.
In the closing stages of the first half, however, the official did award a penalty after Luis Suárez was brought down by Eliaquim Mangala when through on goal.
The defender, who had scored the game's opening goal, was shown a straight red card and Leo Messi netted from 12 yards to put Barça 2-1 up at the time.