Lawrence Frank informed the Detroit Pistons that he should not be retained as head coach unless the organization picks up the team option on the fourth year of his contract, according to league sources.

One week ago, Frank let owner Tom Gores and Joe Dumars know about this in face-to-face and telephone discussions.

Frank has expressed interest in sticking with the Pistons' rebuilding plan.

Frank is guaranteed $4 million for the 2013-14 season and the Pistons control a $4 million option for the 2014-15 season.

The Pistons are set to have significant salary cap space this offseason.