Celtics guard Courtney Lee (sprained left ankle) did not participate in the team's morning shootaround on Tuesday and remains a game-time decision for Tuesday's visit from the New York Knicks. Lee injured the ankle on Friday night in Dallas and missed both the team's game with Memphis on Saturday and practice on Monday. Celtics coach Doc Rivers said Monday that Lee had potential to play in Tuesday's game, but the team was waiting to see how the ankle responded to treatment. The Celtics are without Kevin Garnett, who has inflammation in his left ankle that will sideline him for what Celtics president of basketball operations Danny Ainge guessed would be a two-week span.