The Boston Bruins do not have many holes on their roster this season, but there is one significant question mark that might have to be addressed if they are going to make another serious run at a Stanley Cup this season.

Just what exactly are they going to do to replace David Krejci in the middle of their second line?

For the past 15 years Krejci has been a staple in the Bruins’ lineup and one of the most valuable (and underrated) players on the roster. Smart, skilled, productive, and a rock-solid all-around player that has been a vital cog on a team that has made three Stanley Cup Finals and won one of them, while also being one of the most productive postseason performers in franchise history.

Instead of re-signing with the Bruins this offseason Krejci instead opted to return home to the Czech Republic (where he is dominating so far).

That leaves the Bruins with a question mark on the second line between wingers Taylor Hall and Craig Smith, and could cause havoc with their depth. The one Achilles heel for the Bruins over the past couple of years has been their secondary scoring depth beyond the top line of Patrice Bergeron, David Pastrnak, and Brad Marchand. While that line has dominated the NHL, the team has struggled to outscore their opponents when that trio is sitting on the bench.