Jeremy Swayman was recalled by the Bruins from Providence of the American Hockey League.
The goalie is back with the Bruins while Tuukka Rask recovers from a lower-body injury. Rask is day to day.
"When we left on the road we didn't think there was anything serious with Tuukka," Bruins coach Bruce Cassidy said Saturday. "Obviously got to be a little more than what we anticipated, so that's the move we had to make. [Troy] Grosenick's here on the taxi squad and [in] practice, but if we need to put a goaltender in net 'Sway' will be the guy. Right now we're planning on playing [Linus Ullmark] tomorrow. I'll have to talk to Sway to see when he was last on the ice, but that would be the tentative plan. He's been playing well, 'Ully,' so we're covered there, and hopefully Tuukka's not out too long, but obviously bringing Sway [up], it's more than just a 48-hour thing."
Rask started in a 5-3 loss to the Anaheim Ducks on Monday and was the backup to Ullmark in 4-3 overtime loss at the Colorado Avalanche on Wednesday. Rask was unable to play in a 2-1 win at the Arizona Coyotes on Friday, when Grosenick was the backup, and received treatment Saturday.
Rask had surgery to repair a torn labrum in his right hip last July and signed a one-year contract with the Bruins on Jan. 11. He is 2-2-0 with a 4.28 goals-against average and an .844 save percentage in four games.
Swayman played 16 games for Boston this season and was 8-6-2 with a 2.26 GAA, .918 save percentage and one shutout.
Grosenick was placed on the taxi squad Saturday. The Bruins visit the Dallas Stars on Sunday (7 p.m. ET; SN1, BSSW+, NESN, ESPN+, NHL LIVE).