West Ham United have announced the signing of Barcelona midfielder Alex Song on a season-long loan deal.

The Cameroonian, who has put a temporary end to an unhappy two years at the Catalan club, was unveiled to the West Ham fans ahead of their Premier League match at home to Southampton today.

"I'm very happy to be here and very happy to see the guys and the fans today and to start to do my job for West Ham United," the 26-year-old told the club's official website.

"I think this is very important for me to be coming back to London to West Ham United, which is a club with ambition to build a new stadium and become a big club. I am very excited to be part of this project.

"At the end of the day I chose West Ham because I wanted to come to the Premier League. This is a league which has given me a lot and I didn't finish what I wanted to achieve here. I am very happy to be here and very proud to be part of the project at this club."

Song has become Sam Allardyce's eighth summer signing at the London club.