Source: BBC Sport - Dick Advocaat: Sunderland boss quits Premier League strugglersDick Advocaat has resigned as Sunderland boss, with the team yet to win in the Premier League this season.
The 68-year-old Dutchman was appointed in March, when the Black Cats were one point above the relegation zone.
He guided them to safety and was due to leave the club in the summer, only to sign a new one-year contract.
However, Saturday's draw with West Ham left Sunderland without a win in their first eight league matches and looking for a sixth manager in four years.
Since Steve Bruce was sacked in November 2011, Martin O'Neill, Paolo di Canio, Gus Poyet and Advocaat have managed the club.
Advocaat's departure also follows a trend set by Di Canio and Poyet of managers arriving to save the Black Cats from the drop, only to depart in the next season.
This leaves the club looking for anther new manager?
Who do you think will replace him?