Federer sealed his eighth Wimbledon title with a 6-3, 6-1, 6-4 win over Cilic but the Croatian was clearly hampered.
The first-time Wimbledon finalist broke down in tears during the second set and received lengthy treatment on what he later revealed was a serious blister.
But Federer claims he had no idea about the injury and simply focused on how Cilic was playing.
“I couldn't tell you right now, and I don't know what his problem was really,” Federer said.
Roger Federer didn't know the full extent as to why Marin Cilic needed a medical timeout
Roger Federer won his eighth Wimbledon title at the expense of Marin Cilic
I couldn't tell you right now, and I don't know what his problem was really
Roger Federer on Marin Cilic
“I couldn't tell you if he was struggling moving to his forehand or to his backhand.
“Because he was serving big. He was serve and volleying. So I guess movement for that reason wasn't the biggest problem maybe.
“I thought when he called the doctor first, I thought maybe he was dizzy or something.
“Because I couldn't tell what it was, it actually made things easier.
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“If I saw him limping around, or if I saw him pull up hurt in some place, I would start to think, ‘Okay, maybe I'll throw in a drop shot to really check him out, then one more’ because that's what you do.
“You need to hurt him, you know, where it hurts already.
“Because I didn't know and I couldn't tell, I just said, ‘Focus on your game, focus on your match, keep playing’.
“The good thing is I was already in the lead.”
Marin Cilic needed treatment for severe blistering on his left foot
Federer was two sets to the good when Cilic took the medical timeout and Centre Court erupted 40 minutes later when he served the ace that brought him a 19th Grand Slam title.
However, he admitted that there was a subdued atmosphere during the match itself because of Cilic’s obvious discomfort.
“Of course it's not a five-set thriller, people want to see a tighter match,” Federer added.
“I totally get it. But, you know, I've had those. I’m happy it was different today.”