Arsenal defender Johan Djourou has agreed to join newly-promoted Birmingham on loan until January.
Djourou recently signed a new Arsenal contract
The 20-year-old Switzerland international is Steve Bruce's 10th signing of the summer.
Djourou made 30 first-team appearances for Arsenal last season and signed a new six-year contract.
But Gunners boss Arsene Wenger wants him to gain regular first-team experience and he goes straight into Bruce's squad to face Chelsea.
"I honestly think that Djourou can be an Arsenal defender for 10 years," said Bruce.
"He has got strength, pace, great ability on the ball, is a very good footballer and is comfortable at the back and in midfield.
"We have a good relationship with Arsenal having taken Nicklas Bendtner, Fabrice Muamba and Sebastian Larsson on loan last season, and I am delighted Arsene Wenger has allowed Johan to join us."
Djourou, who was born in the Ivory Coast, has represented his adopted country 11 times and was part of their 2006 World Cup squad.