As the Bruins kick off the 2014-15 season Thursday morning at TD Garden with their official first day of training camp, albeit off-ice testing, many questions surround the Presidents’ Trophy winning Bruins. From who replaces Jarome Iginla on the Bruins top line to who becomes the odd man out on the blueline, there are many questions left unanswered.

After a disappointing early playoff exit last season, the Bruins are looking to bounce back and bring a deep playoff run back to Boston. With the team tight to the salary cap, this summer was an uneventful one for the Black and Gold. Let’s take a look at some of the questions surrounding the 2014-15 Boston Bruins.

Who replaces Jarome Iginla on the top line?

After Iginla signed a three-year, $16 million deal with the Colorado Avalanche on July 1st, the Bruins are left with a hole on their top line. Who fills that hole is one of the biggest question marks facing the Black and Gold. After suffering through two concussions a season ago, Loui Eriksson is expected to step in and take over for Iginla alongside Milan Lucic and David Krejci.

In 61 games with the Bruins last season, Eriksson scored 10 times and added 27 assists during his first year in Boston. A former first line forward with the Dallas Stars, Eriksson could be exactly what the Bruins are looking for as they search for a replacement for Iginla.

Despite being the most logical option on the Bruins’ first line, it may not be the worst idea in the world keeping Eriksson on a line with fellow Swede, Carl Soderberg, as the two developed some tremendous chemistry towards the end of the season and throughout the playoffs last year.

If Eriksson struggles to find chemistry with Lucic and Krejci during the preseason, the Bruins could be left with a rotation of right wingers rolling through the top line.

What do the Bruins do with David Pastrnak?

After becoming the Bruins’ first round pick this past June in the 2014 NHL Entry draft, Pastrnak has already made a name for himself in Boston, and that’s without even appearing in an NHL game. After stealing the show during rookie camp weeks ago, there has been talk of Pastrnak making the big club in his season. Some folks have even gone as far as saying Pastrnak should be the one to fill the void left by Iginla.

At 18 years old, Pastrnak is too young to be assigned to the Bruins AHL affiliate in Providence. That means it’s the NHL, or back to Sweden for the skilled, speedy forward. At 5 feet 10 inches and 167 pounds, Pastrnak certainly needs to grow more in order to make a living in the NHL, but that doesn’t mean he can’t get an early start in the league right out of the gate.

Head coach Claude Julien and General Manger Peter Chiarelli haven’t ruled out the idea of Pastrnak being in the lineup come opening night against the Philadelphia Flyers. There’s a lot more to see from Pastrnak between now and the beginning of October. But regardless of how things play out for him, it will be fun to watch how he fits in with a talented Bruins core.

When will the Bruins sign Torey Krug and Reilly Smith?

Two faces are expected to be missing from TD Garden Thursday morning when the team gets together for the first time since Game 7. Restricted free agents Torey Krug and Reilly Smith are still left unsigned and are expected to remain away from the team until a new contract is reached.

Both Krug and Smith received qualifying offers from the Bruins this summer, but both players are coming off solid seasons and both are due salary increases from their previous contracts. With the B’s in salary cap trouble, signing both Smith and Krug is no easy task. It should come to no surprise if the Bruins move a roster player in order to create the cap space to resign Smith and Krug.

With the Bruins’ depth already in question, the B’s may be shooting themselves in the foot by not getting a deal done with Smith sooner rather than later.

Who becomes the odd man out on defense?

Without Krug being signed, the Bruins have seven NHL ready defensemen signed for the current season. That’s not including David Warsofksy, who will compete for a role on the Bruins blueline this season. With a logjam on the Bruins’ backend, it seems inevitable that the Bruins will move a defenseman prior to the start of the season.

It’s safe to say that Zdeno Chara, Dougie Hamilton and Dennis Seidenberg are not going anywhere. That leaves Johnny Boychuk, Adam McQuaid, Matt Bartkowski and Kevan Miller on the block.

With a friendly $3.36 million cap hit next season and unrestricted free agency on the horizon after the 2014-15 season, Boychuk seems like the Bruins best trading chip, but that may be a mistake for Chiarelli and company. Boychuk is coming off his best season as a Bruin and was arguably the B’s best defenseman last season.  A force to be reckoned with on the Bruins’ blueline, Boychuk would surely be missed should he be shipped out of town.

Do Ville Leino and Simon Gagne give the Bruins anything to work with?

As non-roster invites to training camp, the Black and Gold can’t expect much out of Ville Leino and Simon Gagne, but that doesn’t mean the pair of veteran forwards can’t find a spark in Boston and help a Bruins team looking to build some offensive depth.

After being slowed down by multiple concussions, Gagne sat out the entire 2013-14 season. At age 34, this very well could be Gagne’s last chance to prove he still has some value left in the NHL. With back-to-back 40-plus goal seasons under his belt, Gagne’s NHL resume is an impressive one. Bruins fans will remember Gagne as an important member of a Flyers squad who erased a 3-0 series deficit against the Bruins in 2010.

After being shown the money by the Buffalo Sabres, Leino came nowhere close to living up to the expectations that come with a big contract, scoring just twice in the last two seasons.

With spots up for grabs throughout the Bruins lineup, the Bruins hope that Gagne and/or Leino can give them some much needed offensive punch.