Whelan knows SWP from his time at City.
He told The Sentinel: "Shaun is a top player and would maybe be in the England side if he was playing a lot more.
"You don't go to Chelsea for as much as he did unless you are a good player.
"If he signed for us it would be great – but we'll wait and see who comes in.
"Ask anyone here and they will tell you the better the players who come in, the better it is for us because we will have to raise our game to stay in the team or get back in."