Four clubs have had an offer accepted by City for the highly-rated England international winger.
But reports claim the winger would favour a move to Queens Park Rangers.
Warnock said: “We have made an offer and it’s been accepted.
“There are four clubs who have agreed and it’s really down to the player.
“Joey (Barton) has spoken to him, I think they were room-mates at Man City so that might help.
“I think the big draw for Shaun is going back to London. His mum is there and he’s got a house there.”