Stoudemire is still getting treatment for his bruised left knee, which he suffered during practice on Wednesday after making contact with Chris Copeland on a hard drive to the basket, according to Jared Zwerling of ESPN-New York.
Stoudemire experienced some swelling and tightness in the area afterward, and then missed the Wizards game on Thursday night.
Zwerling reports that Stoudemire said he could suit up to play Boston, but he likely won't for precautionary measures.
"I could play if I needed to, but it's the preseason, so we're not going to force anything right now," he said after practice on Friday at the Knicks' training facility. "A bone bruise is never a fun thing. It takes a while for it to heal. Right now, we're just trying to break up the blood that's in there, loosen it up and get ready."