Yan Valery could make his Birmingham City debut in Saturday’s championship clash with Bournemouth.
The defender, who was on loan from Southampton on the day of the transfer deadline, joined Blues’ 25-man squad and trained with his new team-mates on Wednesday.
He’ll do it again on Friday and face Maxime Colin.
Coming after playing 36 Premier League games with Southampton in the last two seasons, Valery is determined to prove himself to his parents’ club.
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“I was very excited when I found out I could bring him here, and even more so when I met him,” said Karanka.
“I had a good chat with him yesterday before training and you can tell from his experience how hungry he is.
“He really wants to help us and knows that he will help us a lot because he is a very good player.
“Max is doing very well, but he has no replacement, he has played almost every single game.
“It’s true that Josh Cogley played two games and was brilliant. His attitude on the training ground is always perfect.
“But with Yan here we can help Max Colin and put more pressure on him. We have a player who can play as a winger, who can play inside as a midfielder – with quality and experience. “
Valery and Rekeem Harper are the two blues deals made in the transfer window, with Sam Cosgrove the only constant arrival and the head coach hoping they will make a difference.
“I try to improve the squad in every single market and I’m sure we have a better squad than we did at the beginning of the market,” he continued.
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“We have added young but experienced players, all of them of high quality, and everyone is determined to be successful here.
“Above all, Yan and Rekeem want to show their teams that they are able to achieve a good level. I think it’s good that players come here and want to show how good they are because they will help us a lot. “
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For the trip to Dorset, however, the Blues should do without two players.
Marc Roberts will serve the first of three bans on his red card at Wycombe Wanderers while Alen Halilovic is still coming back from an ankle injury.
“I’ll try to train with him tomorrow. We were absent today. He was in the medical department. Let’s see, but I don’t know he can play.”