Matt Murray skated on his own before Pittsburgh Penguins practice Friday.

It was the first time the goaltender was on the ice since sustaining a concussion during practice Monday when he was hit in the head by a shot by defenseman Olli Maatta.

Murray was in full equipment during his time on the ice but did not face shots. He has missed the past two games and is still considered out indefinitely.

"We'll see how he responds and go from there," Penguins coach Mike Sullivan said.

The Penguins, who have lost three straight games (0-3-0), will be without Murray when they host the New York Islanders at PPG Paints Arena on Saturday (5 p.m. ET; ATTSN-PT, MSG+, NHL.TV). They are in third in the Metropolitan Division, two points behind the second-place Philadelphia Flyers and three behind the first-place Washington Capitals.

Murray, who helped the Penguins win the Stanley Cup in each of his first two NHL seasons, is 23-13-2 with a 2.82 goals-against average and .909 save percentage in 41 games this season. He was 9-1-1 in his past 11 games and had allowed fewer than three goals in four of his past six before the injury.

Rookie goalie Casey DeSmith has allowed six goals on 43 shots in two starts in place of Murray. He gave up three goals on five shots in an 8-4 loss against the Boston Bruins on Thursday and was removed 5:27 into the game. He's 3-4-0 with a 2.73 GAA and .913 save percentage in nine games this season.