With their Game 7 Eastern Conference Finals loss to the Miami Heat, the Boston Celtics blew their shot at history to become the first-ever team to come back from an 0-3 NBA Playoffs deficit. With such a disappointing end to the season, the Celtics carry a ton of question marks and have a lot of difficult decisions to make in the offseason, including NBA free agency.

Can this Celtics team win a championship with Jayson Tatum and Jaylen Brown as the two best players? Is the supporting cast enough to propel them to a championship? Do they still need a legitimate lead guard who can take away the play making duties from their turnover-prone wings?

In terms of free agency, the Celtics don't have a lot of contracts off the books from their core rotation. The majority of the team are still under contract in 2024-25. Still, there are some decisions Boston needs to make in terms of locking down the long-term future of the team. With that said, here are the two best players the Celtics must re-sign in 2023 NBA free agency.

1. Grant Williams

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Technically, Grant Williams is the only player from Boston's regular rotation to hit the market this summer when he enters restricted free agency.

Williams played a huge role this season for Boston, logging nearly 26 minutes per game off the bench. He averaged 8.1 points and 4.6 rebounds, while shooting 45.4 percent from the field and 39.5 percent from beyond the arc.

The Celtics rely on Williams' ability to defend multiple positions and as a guy who is willing to scrap and do the dirty work. In addition, he has also established himself as a reliable shooter from long distance.

Williams is reportedly seeking a deal worth $20 million annually, which could be too much for someone who is probably the seventh best player on the roster.

Still, the burly forward may consider giving Boston a hometown discount in order to remain on a championship contender. Several teams may be interested in prying away Williams from the Celtics and extend a deal that may be too much for the Boston's payroll. The Celtics, however, will have the ability to match any offer sheet for the 24-year-old.

2. Kemba Walker

Since Boston doesn't really have any other notable names to re-sign, how about at a former Celtic that they can bring back? Perhaps Boston can give former All-Star point guard Kemba Walker another look.

As mentioned, the Celtics need additional facilitators on the floor, as Tatum and Brown are fully equipped to fulfill that role on a regular basis. With giving Walker another shot, the Celtics get a veteran guard who can still facilitate and create his own shot. In fact, the 33-year-old is just six months removed from scoring 32 points in a game for the Dallas Mavericks this season.

At this point of his career, Walker is always going to carry the injury risk. He has definitely lost a step and this has made him a liability on the defensive end. But given that, he is going to be a low-cost free agent for them. The former All-Star just wants another chance to play in the NBA. Perhaps the Celtics can give him another go.