Boban Marjanovic

Boban Marjanovic, left, is headed from San Antonio to Detroit.

(AP Photo | Rick Scuteri)

The San Antonio Spurs have decided not to match the Detroit Pistons' three-year contract offer to Boban Marjanovic and have renounced rights to the 7-foot-3 center, a source with knowledge of their decision told MLive today.

The decision locks in the Serbian on a $21 million deal.

The Pistons signed Marjanovic to an offer sheet Thursday.

The Spurs had three days to match the offer to their restricted free agent but essentially made their decision known that same morning when they signed Dewayne Dedman to a two-year contract, ostensibly to replace Marjanovic.

The move also clears the way for the Pistons to finalize their five-year agreement with starting center Andre Drummond later this week.

Securing Marjanovic gives the Pistons three centers under contract for 2016-17, along with Drummond and Aron Baynes.

Baynes is under contract two more seasons but the Pistons are concerned that he will exercise his opt-out clause next summer and they could have competitive problems in negotiations to keep him.

Even though Baynes essentially could be playing on an expiring contract next season, the Pistons like him and are not interested in trading him, a team source said after the Marjanovic agreement was struck last week.

The Pistons sought a long-term backup for Drummond and reached agreement last week with Marjanovic under the belief that San Antonio would not match.

While Marjanovic figures to be the Pistons' third center next season, the team signed him with an eye toward making him their second center the following two seasons if Baynes leaves next summer.

-- Download the Detroit Pistons on MLive app for iPhone and Android

-- Like MLive's Detroit Pistons Facebook page