TORONTO, ON - APRIL 16: Patrice Bergeron #37 of the Boston Bruins skates against the Toronto Maple Leafs in Game Three of the Eastern Conference First Round during the 2018 Stanley Cup Play-offs at the Air Canada Centre on April 16, 2018 in Toronto, Ontario, Canada. The Maple Leafs defeated the Bruins 4-2. *** Local Caption *** Patrice Bergeron

Bergeron out for Game 4 with upper-body injury

Claus Andersen / Getty Images Sport / Getty

The Boston Bruins will be without superstar center Patrice Bergeron for Game 4 versus the Toronto Maple Leafs on Thursday night as he's been diagnosed with an upper-body injury and is day to day, the team announced.

With Bergeron out, Riley Nash will take his spot on the top line between Brad Marchand and David Pastrnak. Here's a look at the Bruins' combos amid the shakeup.

#NHLBruins line rushes:

Marchand – Riley Nash – Pastrnak
DeBrusk – Krejci – Rick Nash
Heinen – Kuraly – Backes
Schaller – Acciari – Wingels

Chara – McAvoy
Krug – Miller
Grzelcyk – McQuaid
— Boston Bruins (@NHLBruins) April 19, 2018

The loss is obviously a huge one for the Bruins, as Bergeron is the league's premier two-way pivot, and has contributed five points through the series' first three contests on a line Toronto struggled mightily to contain in Games 1 and 2.