While the news on Courtney Lee's sprained left ankle were positive for the Celtics (he could play Tuesday against the New York Knicks), the news regarding Kevin Garnett's sprained left ankle and foot injury was uncertain. Celtics coach Doc Rivers said before his team took to the practice floor and Sports Authority Training Center that the complete results of Garnett's MRI exam wouldn't be available until later in the afternoon, and he said he was "almost positive" Garnett would not play against the Knicks. What's more, he wouldn' rule out Garnett missing an extended period of time. Garnett injured his left foot in Friday's 114-104 loss to the Dallas Mavericks and missed Saturday's 110-106 loss to the Memphis Grizzlies. "I don't think Kevin's playing tomorrow, I'm almost positive of that," Rivers said. "But then what we want to make sure is that he's going to be good soon." Rivers said he was not concerned about this being a season-ending injury for Garnett, but added: "But can he miss four or five games? Yeah that's probably possible. I don't know that but to me (season ending) is not a concern. He hurt his foot in that Dallas game. (It's not serious) unless something crazy happens in the MRI that I can tell you the first look, they didn't see that. At the end of the day, he may miss some games. "We're going to err on the right side, whatever they decide. If they give me an option of you can play him every third game or give him two weeks rest, I can tell you right now I am going to say two weeks rest, if it's my decision." - See more at: http://www.boston.com/sports/basketball/celtics/extras/celtics_blog/2013/03/doc_garnett_cou.html?camp=twit:celtics&SREF=Optin&dlvrit=834396#sthash.5b9Oiiiz.dpuf