Jordan Staal limped to the bench after being injured in the second period of Game 1 in Pittsburgh. ((Jamie Sabau/Getty Images))

Penguins forward Jordan Staal underwent surgery to repair a foot injury suffered in Pittsburgh's Game 1 victory over the Montreal Canadiens, Pittsburgh coach Dan Bylsma confirmed Saturday.

Bylsma said Staal had "surgery to repair a lacerated tendon in his foot."

Initial reports had Staal out for the rest of the playoffs, but Bylsma said that isn't the case and that Staal is "day to day."

"As far as a time frame goes we will not put a time frame on it at this point," Bylsma said. "But he has not been ruled out for a return."

Staal left Friday night's game midway through the second period and didn't return. He was killing a penalty when he got tangled up with Montreal's P.K. Subban near the Canadiens blue-line and went down. Staal got up favouring his right leg and went immediately to the Pittsburgh bench.

Staal had scored a power-play goal in the first period, helping Pittsburgh to a 6-3 home win.

The Penguins' top penalty killer and a finalist for the Selke Trophy as the NHL's best defensive forward, Staal has two goals and two assists in seven playoff games this year. He played in all 82 regular-season games in each of the last three years.

"Jordan was a guy we looked to, on most occasions, [to put] against their best line or best centreman," Bylsma said. "Sidney Crosby's line will see a little more time probably against the other team's top line. So it will change our matchups."

Staal's wasn't the only significant injury in Game 1. Andrei Markov, Montreal's top defenceman, left the contest midway through the first period after he was checked into the boards by Pittsburgh's Matt Cooke.

The Canadiens confirmed Saturday that Markov, who appeared to suffer an injury to his right leg, is out indefinitely and has returned to Montreal for treatment.