London - Roy Keane stood down as Sunderland manager on Thursday after just over two years in charge.

The Irishman took over in 2006 and led the club back to the Premier League, keeping them in the top flight last term, but six defeats in seven matches have dropped Sunderland into the relegation zone.

In a statement, Sunderland chairman Niall Quinn confirmed that Keane had left the club.

"First of all on behalf of everyone here I would like pay thanks to Roy Keane for all his hard work in progressing this club, lifting its status and growing its worldwide profile," Quinn said.

"Roy deserves huge respect for his contribution and the manner in which he guided the club from the depths of the Championship back to the Premier League.

"His winning mentality and singled-mindedness were just what this Club needed when Drumaville took over shortly before his arrival.

"Roy's decision to stand aside and allow someone else to take charge of the next chapter sums up his desire to always do what is best for the club. Even in his departure he has been more concerned for the welfare of the players and his staff than himself.

"The Board has reluctantly accepted his decision and wish him and his family well for the future."

Keane had cast doubt on his future in recent weeks, saying he did not know if he would be at the club beyond his contract, which was due to end in the summer.

The 37-year-old spent more than 70 million pounds (104 million dollars) on permanent transfers in his time with the club, but very few paid off. (dpa)