Middlesbrough have confirmed the signing of Calum Chambers from Arsenal on a season-long loan.
The 21-year-old defender becomes the latest addition to Aitor Karanka's squad having been dropped following Arsenal's 4-3 defeat by Liverpool in their opening fixture of the season.
"I'm really pleased," Middlesbrough boss Aitor Karanka told the club's official website.
"It's a position where we've been working towards bringing the right player in.
"We haven't been in a hurry because Calum was the player we were waiting for, and he's going to help us a lot.
"I'd like to say 'Thank you' to him because we know he had another offer, but he wanted to come here. That's important and we're looking forward to working with him."
Chambers, who joined Arsenal from Southampton for £16m in 2014, said: "(I'm) excited about the season ahead and can't wait to get going."