Birmingham have completed the signing of Middlesbrough utility man Emilio Nsue on a permanent deal.
The 27-year-old, who can play at right back, right wing and forward, has signed a three-year deal at St Andrews for an undisclosed fee.
Nsue becomes Gianfranco Zola's third signing of the window after Lukas Jutkiewicz and Craig Gardner.
Nsue played a vital role under Aitor Karanka, helping Middlesbrough to win promotion to the Premier League last season having arrived at the Riverside from Mallorca in 2014.