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

The Celtics lost one of their key reserves in free agency as Luke Kornet is headed to the Spurs. Kornet agreed to a four-year, $41 million deal with San Antonio, a source confirmed to MassLive, as the big man got an expected big contract on the open market. ESPN’s Shams Charania was the first to report the deal.

With the signing, Boston likely shifts its focus to retaining their other free agent big man in veteran forward Al Horford.