The Celtics are scouring the trade market for some big men ahead of next week’s deadline. According to Michael Scotto of Hoopshype, the Celtics turned down a proposal from the Chicago Bulls that would have sent center Nikola Vucevic to Boston in exchange for Anfernee Simons and a first-round pick. He’s 35 years old, which magnifies his defensive limitations as he can be repeatedly attacked in the pick-and-roll by faster players. The Celtics will be looking for a longer term answer for their center depth if they are moving notable draft capital for a higher salaried player. Whether they can find the right fit for that type of upgrade in the next week is the question worth watchingThe NBA trade deadline is on Feb. 5 at 3 p.m.