Bruins defenseman Johnny Boychuk has been diagnosed with a mild left knee sprain. Boychuk is day-to-day, according to coach Claude Julien.

Boychuk was injured in the third period of Tuesday’s 5-3 loss to Pittsburgh. Boychuk collided with Arron Asham. Boychuk needed help from Chris Kelly and Brian Rolston to leave the ice, putting no weight on his left leg.

In all likelihood, Game 1 will take place next Thursday at TD Garden. There is no definitive word on whether Boychuk would be available for the start of the playoffs.

Today’s probable lineup:

Milan Lucic-David Krejci-Tyler Seguin

Brad Marchand-Chris Kelly-Rich Peverley

Benoit Pouliot-Brian Rolston-Jordan Caron

Daniel Paille-Gregory Campbell-Shawn Thornton


Andrew Ference-Dennis Seidenberg

Greg Zanon-Joe Corvo

Torey Krug-Mike Mottau

Anton Khudobin

Marty Turco

@GlobeFluto