LAS VEGAS — The Celtics had a fresh face debuting on their Summer League team Friday night as Charles Bassey was an unexpected late addition to the team’s Summer League roster. The former Spurs big man shined off the bench for Boston, posting 14 points and 11 rebounds in the team’s win over the Grizzlies at Cox Pavilion.

With Kristaps Porzingis no longer in Boston, Luke Kornet having signed with San Antonio as a free agent, and the real prospect that Al Horford leaves for anothe