The Boston Globe (Frank Dell’Apa) reports: Celtics forward Brian Scalabrine is out indefinitely after being diagnosed with a third concussion in less than a month. Scalabrine sustained concussions while defending against Dallas’s Dirk Nowitzki Jan. 25 and during a practice session two days later, remaining out until a Feb. 19 visit to Utah. Scalabrine received a blow to the neck during a win over the Nuggets last week and was held out of action, the injury later determined to be a concussion. Scalabrine said he also had concussions while performing for Highline Community College in Washington and against Atlanta last year.