Day one of NBA free agency has come and gone and despite not making major headlines, the Boston Celtics were active. The Celtics brought back a key piece from last year’s team in Jae Crowder, re-signed forward Jonas Jerebko and replaced Brandon Bass with a better player in Amir Johnson.

The moves may not have pleased a fanbase that had high hopes entering free agency, but the Celtics come out a better team. However, after tying up nearly $24 million, free agency may be just about over for Boston. Where do the Celtics go from here? What exactly is the team thinking? To many fans, it may be unclear and understandably so. If you ask me, I’ll bet Danny Ainge has a little something up his sleeve.

The current Celtics roster includes 10 guards and one true center in Tyler Zeller. Kelly Olynyk may be listed as a center, but he’s more of a stretch four. It’s a roster that is heavily dependent on the development of first- and second-year players. If some of these rookies don’t pan out, or if players like Marcus Smart and James Young take a step back in their progression, this season could go south quickly.

It’s also a roster that has only one player over the age of 30 on it. That could mean good news for Celtics fans. The last time the Celtics had a roster this young, most of those players were used to acquire Ray Allen and Kevin Garnett. Perhaps the next big trade is right around the corner.

The Celtics have a wealth of first-round draft picks. Though it remains to be seen exactly where those picks will end up, they are still desirable assets. The team also has an expiring Gerald Wallace contract, a new and improved Evan Turner and a promising player in Jared Sullinger with a bit of a weight caveat.

The struggle for Ainge, which was evident on draft night, is finding the right combination of these assets and finding a suitable trade partner.

Perhaps during his conversation with Johnson, Ainge alluded to a bigger plan that appealed to him. Perhaps it was just the $12 million salary that appealed to him. To me, Ainge is planning something. Whether it be this year, next year or beyond is anybody’s guess. Maybe he is going to try his luck again in free agency with even more cap space next year. Maybe he is working on a potential trade.

Ainge has been able to maintain Boston’s flexibility. Both Johnson and Jerebko signed two-year contracts, but neither is guaranteed after the first year. With the anticipated spike in the salary cap next season, the team is keeping its options open.

Derek McVay is a Boston Celtics beat writer for www.RantSports.com. Follow him on Twitter @mcvay34, or add him to your network on Google.