It still could be for the shot-blocking big man, with other teams interested in swapping out equal or more onerous contracts in exchange, although the Heat are unlikely to take on additional salary beyond the coming season.
Guard Goran Dragic, who also had a June 29 deadline for his player-option decision, last week opted into his $19.2 million for 2019-20 on the final season of his contract, also making him trade eligible for the first time since the trading deadline.
Whiteside at season's end reflected on his decision to re-up with the Heat in 2016.
"When I re-signed with the Heat, it was more of an impulse. I made a decision of re-signing with the Heat, I've got to live with it," he said.
Less than a year after that agreement, the Heat then selected Adebayo with the No. 14 pick in the first round of the 2017 draft and three weeks later added 7-foot Olynyk in free agency.
Whiteside turned 30 on June 13.
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