BOSTON — Celtics center Kendrick Perkins underwent surgery on his left shoulder yesterday to repair an injury that nagged him during the NBA finals and forced him to miss Game Five

The Celtics said Perkins, 23, had arthroscopic surgery at New England Baptist Hospital, as did rookie Bill Walker, who had damage to his right knee repaired.

The NBA champions said both procedures, led by team physician Dr. Brian McKeon, were successful. No timetable has been set for the players’ off-season returns to the Celtics, but Perkins’ agent, Bob Myers, said yesterday that Perkins will spend the next couple months rehabilitating, and “just wants to get ready for training camp at this point.”

In 2006, Perkins dislocated his left shoulder, missed three games and needed surgery after the season to repair it.

The shoulder nagged him again late last season, and he aggravated the injury in the finals against the Lakers, causing him to miss Game Five.

The Celtics obtained rights to the 6-foot-6 Walker, out of Kansas State, in exchange for cash after he was chosen with the 47th pick by Washington in last week’s NBA Draft.

He injured his right knee in a pre-draft workout last month and missed the Celtics’ rookie camp.