"El-Hadji is a great signing for us and we're thrilled to get him in," Sunderland boss Roy Keane told the club's official site.

"He has bags of Premier League and international experience, which is exactly what we've been targeting this summer.

"El-Hadji has always been the kind of player opposition teams and supporters love to hate, a thorn in the side, and that's why we're delighted to have him in our squad."

Diouf, who quit the Senegal national team after CAN 2008, is the Black Cats' fifth signing this summer.

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