Sandow is contracted to the Wolves for 2018.
Love Rugby League broke the news in October that the grand final may have been his last game for Warrington.
Warrington have released this statement today: “The club have recently been informed that Chris Sandow has decided not to return to Warrington Wolves for the 2017 season. The club have been notified of Chris’s decision by his agent.
Karl Fitzpatrick, Head of Rugby Operations said “Chris is contracted until the end of 2017 and should have reported for pre-season training today (21 November).
“This is a clear breach of contract. We will be retaining his registration until further notice.
“We the club are disappointed that Chris has decided not to return, we are already underway in monitoring a potential replacement both internally and externally.”