Watch: Frustrated Neymar smacks Valencia player after final whistle

Barcelona star Neymar may find himself in a spot of retroactive trouble after lashing out at a celebrating opposition player after the final whistle.

The Brazilian forward was feeling frustrated after his team lost its third consecutive game on Sunday, dropping a 2-1 result to Valencia at Camp Nou. Barcelona is now level with Atletico Madrid at the top of La Liga at 76 points, with Real Madrid one point behind in third.

As a result, Neymar was caught on camera delivering a quick smack to the back of Antonio Barragan's head as he and teammates Shkodran Mustafi and Dani Parejo celebrated their victory.