Since joining Crystal Palace from Watford in the summer for £6m, the midfielder has not made a single appearance for the club, being a regularly unused substitute.
"He will have to get a chance," Vieira stated during his pre-match press conference.
"We have a squad where we have players who have not had their chance yet, but at the same time, they have to be ready for it.
"We will get to a time where the team needs them and they will have to perform. Will is one of them. I am really happy with what he is showing me in training and he is just waiting for his opportunity."
The Eagles shall be hoping to continue their seven-match unbeaten run on Saturday when they host Steven Gerrard's squad. body check tags ::