It is not yet clear whether the former Manchester United ace quit or was sacked.
Sunderland spent £35million in the summer but have lost six of their last seven matches.
Keane took charge at the Stadium of Light in August 2006.
It is not yet clear whether the former Manchester United ace quit or was sacked.
Sunderland spent £35million in the summer but have lost six of their last seven matches.
Keane took charge at the Stadium of Light in August 2006.
