The Boston Bruins are preparing to play the Detroit Red Wings on Friday and we've already learned that Jake DeBrusk is out. 

With back to back games on tap for the Bruins, head coach Bruce Cassidy has decided to make some lineup changes and mostly on defense. 

Charlie McAvoy is no longer with Zdeno Chara as he's now been paired up with Matt Grzelcyk.

Chara found Connor Clifton on his side on the team's first pairing. 

Take a look at what Cassidy put together at practice today:

Marchand - Bergeron - Pastrnak
Cehlarik - Krejci - Heinen
Bjork - Coyle - Senyshyn
Wagner - Kuraly - Ritchie
Nordstrom - Lindholm

Chara - Clifton
Krug - Carlo
Grzelcyk - McAvoy
Kampfer - Miller