In a Game 7 that ultimately ended the Boston Celtics' season, star forward Jayson Tatum made the difficult call to sit out against the Philadelphia 76ers—and now he's opening up about why.

The Celtics fell 109-100 in Saturday's decisive matchup, with Tatum sidelined due to stiffness in his left knee. The decision wasn't made lightly, and Tatum broke down the process in an interview the following day.

"The staff, the medical team, they just kind of assessed everything that was going on," Tatum explained. "I was in the window of return-to-play protocol, and there were just certain rules and a plan that we had to stick by."

The timing of the injury added an extra layer of drama. Tatum first felt the issue during the second half of Game 6 on Thursday night, but initially, it didn't seem serious enough to keep him out of the winner-take-all contest. Head coach Joe Mazzulla even told reporters during Friday's press conference that Tatum would play, and the team later left him off the injury report entirely.

But by Saturday afternoon, the situation had changed. The Celtics first listed Tatum as questionable, then ruled him out just hours before tip-off—a sudden shift that left fans and analysts scrambling for answers.

Context matters here: Tatum is still just over a year removed from a torn Achilles, an injury that would give any player—and any franchise—reason to be cautious. In a normal situation, he might have pushed through the stiffness. But with that recent history, the risk simply wasn't worth it.

"If it were any other player, maybe the calculus is different," one NBA insider noted. "But coming off an Achilles, you have to protect the long-term investment."

The absence was felt on the court, but the 76ers themselves admitted that Tatum not playing actually made the game harder in some ways—an unexpected twist in an already dramatic series. For Celtics fans, the decision was a tough pill to swallow, but it underscores the delicate balance between short-term glory and long-term health in today's NBA.