Midfielder Liam Trotter has rejoined League One Millwall on a month’s loan. Trotter made one start and two sub appearances in a previous spell at the Den in 2006.
Trotter has struggled to regain his place in the Town first team in recent weeks, having featured regularly until late October.
The 21-year-old is contracted to the Blues until June, having been on loan at Scunthorpe last season, with whom he faced Millwall in the League One play-off final at Wembley in May.
Trotter will formalise his move later this week ahead of Saturday’s game at Carlisle or if that match is off ahead of the Lions' following league game. Town have not given permission for him to feature in the FA Cup.
Meanwhile, boss Roy Keane has emphasised the importance of recruiting players with the right character as the January transfer window opens: "There are a lot of hurdles to overcome in signing a player.
"Players generally are in a very strong position, an unbelievably strong position with the freedom of contract. That's why it's so important that when you sign a player, you get the right characters.
"You want players who are going to give it everything, keep their head down and work hard and not cause any trouble.
"Looking at it from both sides, when I was a player and my contract was coming up, I was in a very good bargaining position. Now as a manager, I am trying to do deals with players and it's very different."