Marcus Smart has agreed to a four-year, $77.1 million contract extension.

The deal is for the maximum amount Smart could sign for on an extension, though far less than he could have had he waited until free agency.

Smart's deal begins for the 22-23 season and also includes a trade kicker. Smart's deal, however, does not include a player option. 

Smart averaged career highs in points (13.1), assists (5.7), blocks (0.5) and minutes (32.9) for the Celtics last season.