The Bruins' center is suffering from "real memory problems and he's quite worried about it," according to ESPN.com.
A source relayed the news to ESPN's Pierre LeBrun.
Savard suffered a major concussion more than a year ago, when Matt Cooke blind-sided him on March 7, 2010, in Pittsburgh. He missed roughly two months before returning for the Bruins' second-round playoff series, playing in all seven games and registering a game-winning goal and two assists. After experiencing setbacks in the summer, Savard missed the first 23 games of the 2010-11 season. He returned to post 2-8-10 totals in 25 games, but a hit in Colorado ended his season.
Savard said in early February that he had not made any long-term decisions for his career.
"I've tried to stay away from that right now," Savard said after Bruins general manager declared the playmaker's season to be over. "It's tough enough as it is not to be able to finish the season. I'm obviously going to get some more medical stuff done, some tests, then I'll be able to make a clearer decision on what my future is. Right now, I'm hoping to be able to continue at some point again."