Sunderland have completed the signing of Anton Ferdinand from West Ham.
Ferdinand has signed a four-year deal at the Stadium of Light after the Black Cats agreed an undisclosed fee with the Upton Park side for the central defender.
The England Under 21 international underwent a medical on Wearside on Tuesday and he has now completed the formalities of his move to become Sunderland's ninth signing of a busy summer.
Black Cats boss Roy Keane believes Ferdinand will prove a valuable addition to his new-look squad.
"We needed to strengthen our defence and Anton is a great signing," Keane told the club's official website.
"He's still young but he has over 160 games under his belt so he has experience, he's learning his trade.
"He'll bring quality and competition for places which is what we want, hopefully we can take him to another level here at Sunderland.
"He has come through the ranks at West ham and maybe just needs a change."
Ferdinand admitted it was a wrench to leave Upton Park, but revealed Keane played a big part in his decision to join Sunderland
"It was hard leaving West Ham because I have been there for 16 years but after meeting Roy Keane I knew it was time for a chance," said Ferdinand.
"This is a great challenge for me and I feel it is an exciting time at Sunderland. I think the move will do me good.
Keane revealed he is targeting one more player - possibly a left-back - before the transfer window closes next week.
"I have one more player in mind and then that is the end of it for a few months at least," concluded Keane.