The result means Atalanta are into the quarterfinals 8-4 on aggregate.
“I just focus on what I am doing, not the defenders who are in front of me. I see a space and I go there," Ilicic told Sky Sport Italia.
“I saw he made a sliding tackle that he shouldn't have done, so if I managed to cut back, he'd inevitably catch me for a penalty. On the second penalty too, it was a wet turf, so I imagined it would take that bounce and hit him on the hand, as it was very wide.
“I tend to only worry about what I need to do, though, not the identity of the defender I am taking on. I don't really study them."
Ilicic has scored 21 goals in 29 competitive games this season.
“The older I get, the better I play. I am having fun, I want to keep going and we are really enjoying our football. It's a pity there are no fans here, but we have to entertain them and make those at home celebrate."