FIFA sure took a bite out of Uruguay's World Cup prospects …
It wasn't a deliberate foul (contact was almost certainly incidental) but its still a foul. The rules say that physical contact on a challenge is permitted but is ruled an offence "only when an opponent is adversely affected". You can make an attempt to take the ball away from an opponent by however means you want, but you can't physically alter the attempted movement of your opponent while doing so.
Apologies, but having refereed for 10 years, there is no way thats a foul.