Wallace attempted a comeback last season with the New York Knicks, playing just 21 games during an injury-plagued run.
He's the second member of last year's Knicks team to suit up and start coaching, joining Jason Kidd who became the Brooklyn Nets' head coach back in June.
According to Wallace, the Knicks offered him a job on their staff following last season, but the Pistons gave him the opportunity to join their staff, plus it gave him a chance to be around his children, who live near Detroit.
It's a reunion for Wallace and Cheeks, who coached the big man between 2001 until his departure from the Pistons in 2003.
He may have been a hot head as a player, but Cheeks seems confident Wallace will make the transition from player to coach nicely. Cheeks said of Wallace:
He can make that transition. A lot of us, we didn't start out being a certain way we are right now. But change evolves you, and he's evolved. He realizes he's in the second phase of his life now. And now he's a coach. He has to make that transition, and I think he'll be fine.
Wallace actually joined the Pistons Monday afternoon for their summer league game against the Boston Celtics.