In fact, Handanovic came out to deny a nice run from a PSV player, who managed to poke the ball past the goalkeeper. The latter then stopped the ball with his hand, but the referee decided to only show a yellow card as he deemed it wasn't a clear-cut opportunity. 

 

However, had Handanovic not touched that, then the PSV player would have had an open net to aim at. On Twitter, several fans reacted on the matter, which you can see in our gallery, as well as the incident itself.