PITTSBURGH -- Matt Murray will be out indefinitely with a concussion, Pittsburgh Penguins coach Mike Sullivan said Tuesday.

The goalie was diagnosed Tuesday morning after first being evaluated following practice Monday, which the 23-year-old left early after taking a puck to the head on a shot by defenseman Olli Maatta. Murray will not play against the New Jersey Devils at PPG Paints Arena on Tuesday (7 p.m. ET; TVAS, SN, ATTSN-PT, MSG+, NHL.TV).

The Penguins are third in the Metropolitan Division, one point behind the second-place Washington Capitals and two behind the first-place Philadelphia Flyers. Pittsburgh leads New Jersey by four points.

Rookie goalie Casey DeSmith is expected to start Tuesday with Tristan Jarry backing up. Sullivan said he's comfortable moving forward with DeSmith, 26, and Jarry, 22, for the time being.

Jarry is 10-4-2 with a 2.58 GAA and .916 save percentage in 20 games this season. He allowed four goals on 16 shots in a 6-5 loss to the Florida Panthers on Saturday.

DeSmith is 3-3-0 with a 2.23 GAA and .926 save percentage in seven games (five starts) this season.

"We believe in the guys we have," Sullivan said. "Both Casey and Tristan are very good goalies. They've played extremely well for us. They've helped us win games when they've been in the lineup. We've had some success with some inexperienced guys."

Murray is 23-13-2 with a 2.82 goals-against average and .909 save percentage in 41 games. After returning Jan. 30 from missing seven games following the death of his father, James, Murray won eight of 10 games (8-1-1).

Murray missed six games with a lower-body injury sustained against the Philadelphia Flyers on Nov. 27. He returned against the Vegas Golden Knights on Nov. 14.

In his third NHL season, Murray helped the Penguins win the Stanley Cup the previous two seasons while splitting time with Marc-Andre Fleury.