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.

The Celtics have made their first move of free agency on Monday night, agreeing to terms with former Wolves big man Luka Garza, a source tells MassLive. The deal with Boston is a two-year pact for the veteran’s minimum. ESPN was first to offer the deal.

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