On October 5, 2018, Kyrie Irving revealed to a crowd of Celtics ticket-holders he intended to re-sign in Boston this summer.

But according to Bleacher Report's Howard Beck, Irving was already plotting his next move either before or shortly after that announcement.

In a column Monday, Beck reported Irving and his good friend Kevin Durant had "resolved" to play together during the 2019-20 season "over a series of conversations before this season even began."

Per Beck, Irving and Durant discussed many possibilities, including teaming up on the New York Knicks and even Durant coming to Boston to play with Kyrie.

But both players soured on the Knicks after their rough start to the 2018-19 season, according to Beck, and actually had their sights set on Brooklyn by "midseason."

Simply put, the Nets had the superior roster, the more proven front office, the better infrastructure to support two superstars. Irving and Durant both recognized it by midseason, according to knowledgeable sources.

It was around midseason when Irving publicly changed his tune about re-signing with the Celtics, famously telling reporters to "ask me July 1" about his free-agent future. And as the Celtics limped into the playoffs as a No. 4 seed, Irving and Durant already had "the outline of a plan" set, per Beck.

"Once Irving locked on Brooklyn, Durant was almost certain to join him," Beck wrote. "He never considered going to the Knicks alone."

Irving and Durant officially made good on their promise Sunday night, agreeing to team up in Brooklyn while the Celtics and Golden State Warriors turned to their respective Plan Bs.

Turns out NBA fans were right to freak out over that NBA All-Star Weekend hallway video...

Click here to download the new MyTeams App by NBC Sports! Receive comprehensive coverage of your teams and stream the Celtics easily on your device.