The addition of Garza will soften the blow of losing Kornet, but Boston will need to do some work -- potentially a lot -- to shore up their big men.

Boston Celtics player Luke Kornet will be headed to the San Antonio Spurs after agreeing to a four-year $41 million contract, reports say.

According to a league source, Kornet has agreed to a four-year, $41 million with the Spurs, and Horford is mulling over offers.