Mitchell Robinson, a key player for the New York Knicks' recently crowned NBA championship team, is set to leave the franchise for a multi-year deal with the rival Boston Celtics. The free agent center has agreed to a three-year contract worth $47.4 million, with a player option for the third season, according to ESPN NBA insider Shams Charania.

Robinson was the longest-tenured member of the Knicks' roster that secured the franchise's first NBA Championship in 53 years, defeating the San Antonio Spurs led by Victor Wembanyama.

His departure to the Celtics, a longtime rival of the Knicks, comes as a surprise just weeks after the team's historic victory. Robinson had been a fixture for the Knicks, contributing significantly to their championship run.