Ravel Morrison is at the top of Birmingham manager Lee Clarke's list of players he wants in next season's squad.
The West Ham midfielder impressed during his season-long loan to St Andrews, and Clarke is keen on striking another deal for the 2013-14 campaign.
Newcastle United's Shane Ferguson had a shorter spell with Birmingham towards the end of the season, but is another that Clarke is looking to have at his disposal again.
"I have made it common knowledge that I would like to re-sign Ravel Morrison and Shane Ferguson," Clarke declared.
"We have registered our interest in bringing those lads back so that's a possibility.
"Ravel and Shane have both indicated to me that they would like to come back.
"The thing with Ravel is that, for a manager, he has been a challenge, without a shadow of a doubt.
"But it's a challenge I have relished and I have enjoyed trying to help him learn, not just about the football side, but off-the-field stuff, how you behave as a professional."
With Birmingham looking to enhance their squad following a disappointing campaign, where they finished 12th in the Championship, Clarke has an idea of the number of players he needs.
"I am hoping that maybe I can get two more in, possibly three," Clarke added.
"And then what I need to do is reassess. Do I wait later on in the window on the loan deals from the Premier League?
"What most of the big clubs do is take their young players away on pre-season tours with them and decide whether they are going to be part of the squad or whether they need another bit of loan time to help their development."