The Boston Celtics are expected to be active this offseason after their disappointing exit from the 2026 NBA playoffs.While the Celtics began the season with low expectations due to Jayson Tatum‘s injury, Jaylen Brown led them to the No. 2 seed in the East. However, they failed to advance past the first round and got eliminated by the Philadelphia 76ers in seven games.The Celtics have already been linked to several players, such as Giannis Antet…