The Mali international has penned a four-year contract after Barca agreed to pay his £9 million buyout clause.

New Barca coach Pep Guardiola had Keita's capture high on his shopping list as he sees the left-sided midfielder as a direct replacement for Deco. Keita's Barca deal carries a £60 million buyout clause.

"I do not like to talk because I believe that in football there is too much talk off the field. I just want to say that I hope to contribute a lot to the club, as I did with Sevilla. But I do not want to talk too much, because in football it is unnecessary to talk a lot," said Keita.