The celebrity boxing rivals are set to announce the latest rescheduling of their grudge match, slated for February 25 in Saudi Arabia.
According to journalist Ariel Helwani, both have agreed and signed to Voluntary Anti-Doping Association testing.
It means VADA can visit the pair unannounced at any point in their training camps for drug tests.
Having the testing agency involved was one of the demands Fury made in contract talks with Paul last year.
It is now the third time they will attempt to settle their score in the ring.
Fury, 23, was forced to pull out in December 2021 due to a rib injury and then last August amid a US visa issue.
The travel woe still persists today, which left the UK and Middle East as frontrunners to host the bitter bout.
Paul, 26, even offered to travel to Manchester on February 18 and fight Fury on enemy territory.
But a more lucrative deal in Saudi Arabia a week later was proposed and looks to have won the race.
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Saudi boxing boss Prince Khaled added to further speculation as he posted a video with the tune, “signed, sealed, delivered.”
Fury last boxed in Dubai in November in a last-minute exhibition against Rolly Lambert, 33.
And Paul was a special guest commentator and slammed the six-round bout from ringside.
Just a month prior, he had beaten UFC legend Anderson Silva, 46, to mark the biggest win in his 6-0 career.
Both are in training for the fight, which is due to be announced and confirmed at the end of this week, ESPN say.