This is getting pathetic. The guy plays for Leicester, a newly promoted side, against one of the biggest clubs in the world, trailing 3-1. He isn't exactly a contender for the Ballon d'Or either, so I'd say: Let the guy pull all the tricks he knows to somehow stand a chance. It is up to the ref to sort out what's what, and that is the guy who made the mistake.
Furthermore, an attacking force of RvP, Di Maria, Falcao and Rooney scored less than... what were their names again? Our defensive performance today was a joke, dives and refereeing decisions did not change that, and we rightfully lost the game due to our own incapabilities.
If Manchester United, after going on an absolute spending frenzy in the summer, concedes five against a newly promoted side, the debate over one penalty is simply ridicoulous.