The news comes after Stein reported Thursday that Hayward officially informed the Jazz he will decline his player option for the 2017-18 season and test the open market.
The Jazz, Celtics and Heat have been considered the front-runners to sign Hayward for weeks, and they'll each have a compelling pitch to make when they get in the room with the 2016-17 All-Star.
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Boston will not only be able to try to sell Hayward on a reunion with former Butler Bulldogs head coach Brad Stevens, but it can tout a defined long-term plan for contention in the wide-open Eastern Conference.
According to The Vertical's Adrian Wojnarowski, the Celtics will attempt to trade for Indiana Pacers swingman Paul George if they can secure a commitment from Hayward during the early stages of free agency.
If the Celtics can do that, they will tout a cadre of studs that includes Hayward, George, Isaiah Thomas and Al Horford.
The Heat, meanwhile, have team president Pat Riley and head coach Erik Spoelstra at their disposal to persuade Hayward to move to South Beach and join a franchise renowned for its winning culture.
Hayward would also be able to form a versatile trio in Miami alongside center Hassan Whiteside and point guard Goran Dragic.
On Thursday, Stein provided an update on where the Heat and Celtics stand in their pursuit of the 27-year-old:
Then there are the Jazz, who helped develop Hayward over the past seven seasons, turning him into a player who will likely garner a maximum contract.
As things stand, the Jazz could be in a tough spot since they're trying to convince Hayward to stay in the Western Conference and compete alongside the likes of the Golden State Warriors and Houston Rockets, while the Heat and Celtics could have clearer paths to a conference title.
That said, the allure of extra cash could always keep Hayward tethered to Utah.
Once free agency opens, the Jazz will be able to offer Hayward a more lucrative five-year max, while all other parties can extend offers that cap out at four years.