Remember when the Boston Celtics made a serious push for Kevin Durant during the 2016 offseason?

Apparently he wasn't the only player who would have come to Boston in that scenario.

Retired NBA guard Ray Allen, who spent five seasons in Boston from 2007 to 2012, admitted Thursday he spoke with Danny Ainge in 2016 and told the Celtics president of basketball operations he was open to re-joining the C's if they landed Durant in free agency.

"I had a conversation with (Ainge) and I told him this was my last-ditch effort. I would’ve went back,” Allen said on WEEI's "Ordway, Merloni & Fauria" radio show.

"This was when Kevin Durant was a free agent. He was thinking about going to Boston. And I said, ‘Hey, if you guys land Kevin, I would certainly look at lacing them back up one more time and try to make something good happen here in Boston.' "

Allen was two years removed from the NBA at that point and hadn't played since 2014 with the Miami Heat. But Allen played the "sidekick" role well during his stint in Boston, winning an NBA title in 2008 after forming the "Big Three" with Kevin Garnett and Paul Pierce.

Allen didn't have the cleanest split with the Celtics: Several C's players bristled at the sharpshooter's decision to reject Boston's contract offer to sign with the Heat in 2012, taking issue with Allen's lack of communication over his decision.

Pairing Allen with Durant would have made the Celtics an instant title contender, though, and likely would have helped Allen put his past behind him.

Alas, a cameo from Tom Brady wasn't enough for the C's to prevent Durant from joining the Golden State Warriors, leaving fans to ponder this new twist to one of the NBA's great "what ifs."

Don’t miss NBC Sports Boston's coverage of Celtics-Warriors, which tips off Friday at 9:30 p.m. ET with Celtics Pregame Live, and then Mike & Scal have the call of the game at 10:30 p.m. You can also stream the game through the MyTeams App.