The City boss is expecting bids for the keeper who joined the keeper from Carlisle in the close season for a fee of up to £750,000.
Westwood was superb on Monday night at Birmingham in the game shown live by Sky and the City boss is expecting plenty of interest in the keeper.
"There will be a lot of talk about Keiren Westwood in January," said Coleman to the CT. "It wouldn't surprise me if we got a few phone calls but we are building and still nowhere near where we want to be in terms of mounting a challenge in this league.
"We are on our way there, I can assure you of that and we are more than happy with the players we have brought in.
"Keiren is playing at a higher level with and against better players and on a bigger stage and that is bringing the best out in him.
"He's only 23 and got years ahead of him and he's got a lot of potential which we have seen in games he has played for us. "I was delighted when we signed him and and I haven't been disappointed."
Seen as the best keeper in the Championship and certainly the best keeper at Coventry since Chris Kirkland, it is understood that it would take a fee of more than that paid for Kirkland by Liverpool for City even to discuss the matter.