Bryn Morris has been loaned to Northampton for the remainder of the 2020/21 season.
The 24-year-old midfielder has made 18 appearances this term, most recently appearing in the Papa John's Trophy defeat at Peterborough.
Blues boss Kenny Jackett said: "It gives Bryn an opportunity to go out and hopefully get some regular football again, so we wish him luck at Northampton."
Northampton won the League Two play-offs last season and are currently sitting 20th in the third tier standings.