Richard Foster admits the loss of striker Kenny Miller would be a big blow to Rangers' hopes of retaining the Clydesdale Bank Premier League title.
The Scottish champions confirmed on Friday night they had accepted an offer, believed to be around £600,000, from Barclays Premier League side Birmingham.
Miller has already netted 22 goals for Rangers this term, and Foster said: "I think we've got a better chance of winning things with Kenny still here. I'm glad that decision is not mine to make and I'm sure whatever happens, the rest of us will just have to get on with it. But I would like him to stay."
He added: "Everyone has seen what Kenny has brought this season with his goals but he brings more than that, he's a clever player and he brings other players into the game.
"Especially this season, he has been a massive player for Rangers."
Goalkeeper Allan McGregor has also been linked with a summer move south of the border and Foster knows his departure would mean the loss of another crucial member of the squad.
He added: "I don't think there is a better goalkeeper in Scotland than Allan McGregor, I don't think there is a better Scottish goalkeeper.
"These are big players and, if we want to win things, I think we need to keep hold of them."
Miller is now thinking over the personal terms offered by City before deciding whether or not to move to St Andrew's.
A statement from Rangers read: "Rangers can confirm the club has accepted a bid from Birmingham for Kenny Miller. The striker is now free to discuss personal terms with the Premiership side."
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