He told Sky Sports News: "He is one of the players that we are looking at.
"That is all I will say at the moment. I've been in football long enough to say that is not done until it's done. He's one of the players we are looking at, but it is far from done."
Palace boss Ian Holloway has stipulated that any deal for Zaha this month must include provision for the 20-year-old to finish the season with the Championship club.
And Gill made it clear he would accommodate that demand, saying: "Even if we did do something with Wilfried, that would be for the summer."