Carolina Hurricanes goalie Petr Mrazek is day-to-day with a lower-body injury, and defenseman Trevor van Riemsdyk is out with an upper-body injury.

New York Islanders defenseman Johnny Boychuk will miss three to four weeks with a lower-body injury, general manager Lou Lamoriello said Friday.

Boychuk was injured in the second period of the Islanders' series-clinching win over the Pittsburgh Penguins on Tuesday. 

The timeline would knock Boychuk out for at least the team's second-round series.

Carolina Hurricanes forward Andrei Svechnikov, 19, is in the concussion protocol after being knocked out by Alex Ovechkin in a fight during Monday night's game.

Hurricanes coach Rod Brind'Amour made the announcement, saying he assumed that Svechnikov would miss Thursday's Game 4.

Capitals star Alex Ovechkin fought -- and knocked out -- Hurricanes forward Andrei Svechnikov in the first period of Game 3 in the teams' first-round series on Monday night.

Svechnikov, 19, is the youngest player in the NHL playoffs this season.

The injury suffered by Edmonton Oilers star Connor McDavid in the regular-season finale was to his posterior cruciate ligament, a source confirmed to ESPN.

The injury does not require surgery, and McDavid is expected to be ready for training camp in September, according to the source. The diagnosis was first reported Saturday by TSN.

Evgeni Malkin might be ready to get back to work. The Pittsburgh Penguins certainly need him.

The veteran center practiced with his teammates on Wednesday and could be back in the lineup on Thursday against Detroit.