A photograph of Leo Messi alongside a football supporter has set social-media chins a-wagging over the rather unusual shape of the Barcelona star's right knee.
Messi, partner Antonella Roccuzzo and their children are currently on holiday on Ibiza with friend and former club-mate Cesc Fàbregas and his family.
"Is Messi growing another leg from his knee?"
And having agreed to pose for a photo with a fan, the resulting snap has left many scratching their heads over the Argentine's apparently over-protruding kneecap.
"Is Messi growing another leg from his knee?" asked the soccer website 101 Great Goals, with Twitter users suggesting his "mutant knee" had to be a Photoshop job...