NBA Legend Tim Duncan signed up to be an assistant coach for the San Antonio Spurs, not to be taking shots from head coach Gregg Popovich or former teammate Steve Kerr before he even begins his new job.

Popovich already took a shot at Duncan when he hired him in July.

RELATED: Manu Ginobili Had the Perfect Response to Tim Duncan Becoming a Spurs Assistant

This week he questioned his rookie assistant’s basketball knowledge.

Flip the Pages to See What Pop and Kerr Had to Say About Timmy: