WALTHAM – While the news on Kevin Garnett was gloomy on Thursday afternoon, there was one ray of hope as Celtics coach Doc Rivers said there’s a 50-50 chance Brian Scalabrine could return by Game 3 of the series with Chicago.

“Scal is a positive sign,” Rivers said. “He gets to do 2-on-2 (drills) and things like that today. He’s definitely out for the first two games. There’s a 50 percent chance that he can play by Game 3 but that’s if everything goes perfect.”

Scalabrine suffered a pair of concussions days apart in late February and hasn’t played since while recovering from post-concussion syndrome. He missed the final 24 games of the regular season.