Al Horford opted out of the final year of his contract in Boston, with reports suggesting that the All-Star big man was set to receive a four-year, $100-million plus contract from a team other than the Celtics.
The Celtics seem to have moved on, with All-Star point guard Kemba Walker set to sign a four-year, $141 million contract in Boston when free agency begins at 6 p.m. E.T.
Details surrounding Horford's next team are unclear, with several franchises - from New Orleans to Dallas to Sacramento to Philadelphia - getting mentioned as possible contenders for the veteran big man.
However, another surprising scenario could be in play.
There's been talk of a "mystery team" for Horford and, to date, that team has yet to be identified. Could it be...Boston?
The Ringer's Kevin O'Connor reported this afternoon that people within the league believe the Celtics could be working on a surprise Horford scenario.
This would be trick, as mentioned, as it would require a couple of different sign-and-trade scenarios.
Boston has yet to renounce Terry Rozier's restricted free agency, though, which could make this possible.
A Celtics team with Walker, Marcus Smart, Jayson Tatum, Jaylen Brown and Al Horford would be pretty fun to watch.
We'll find out how serious Boston is about this potential scenario when free agency begins at 6 p.m. E.T.