Rask has signed a professional tryout agreement with the Bruins on Thursday, Elliotte Friedman of Sportsnet.ca reports.
Rask will bring his professional career to a close, his team announced Wednesday.
Rask (lower body) is set to miss at least a week after coach Bruce Cassidy told reporters the netminder "won't be practicing this week," Conor Ryan of MassLive.com reports.
Rask (lower body) will not suit up Sunday against Dallas, Kevin Paul Dumont of The Boston Globe reports.
Rask (lower body) is not available Friday against Arizona, Kevin Paul Dupont of the Boston Globe reports.
Rask made 22 saves on 27 shots in a 5-3 loss to the Ducks on Sunday.
Rask will patrol the crease Monday against visiting Anaheim, Steve Conroy of the Boston Herald reports.
Rask stopped 22 shots in Saturday's 3-2 win over the Jets.
Rask will start against visiting Winnipeg on Saturday, Fluto Shinzawa of The Athletic reports.
Rask gave up five goals on 12 shots before being replaced by Linus Ullmark to begin the second period of Tuesday's 7-1 loss to the Hurricanes.