Flores is out of the Capital One Cup final due to injury.
"I'm gutted for Chico," said Williams. "I've spoken to him and I'm just so disappointed for him. What can you say to him?
"He's been brilliant this season and deserves to play, but injuries happen and hopefully we'll try and win it for him and get him a medal.
"I enjoy playing with Chico but the good thing about us is this year is that we've got a squad, so it shouldn't be a problem."