BOSTON -- The Boston Celtics have had a tricky time nailing down a meeting with free agent Blake Griffin because of clashing priorities, according to a source with knowledge of the situation.

The source told MassLive.com Friday afternoon that Griffin is said to prefer exploring his options early in the free agency period. That has made things difficult with the Celtics, who have other priorities, like the pursuit of Gordon Hayward and potentially a trade for Paul George.

The Vertical's Adrian Wojnarowski reported earlier this week that Griffin could be Plan B, behind Hayward, in Boston's dream of signing one star and acquiring another via trade. But Hayward has visits set with the Celtics, Utah Jazz and Miami Heat, and could take several days to make a decision.

As Hayward gauges his opportunities, Griffin will look into his own. There's some speculation the recent Chris Paul trade might actually raise the odds of Griffin staying with the Los Angeles Clippers; they are reportedly focused on keeping Griffin after losing their other top player. The Phoenix Suns are also reportedly scheduled for a meeting with Griffin this weekend.

Because of Griffin's long injury history, teams will likely want to examine his medical information before offering a big, lengthy contract.