McGregor became the first UFC fighter to hold two titles simultaneously when he became lightweight champion by knocking out Eddie Alvarez at Madison Square Garden in November 2016 to win the lightweight belt, but he has never defended it.
The 29-year-old Irishman was also previously stripped of the featherweight title, which he won against Jose Aldo with a stunning 13-second knockout in December 2015, without mounting a defence.
McGregor's only fight in 2017 was a lucrative boxing bout against the undefeated Floyd Mayweather, which he lost.
Durable American Ferguson, who won the interim title created during McGregor's layoff by defeating Kevin Lee in October 2017, will meet Nurmagomedov, the 29-year-old hot prospect from Dagestan.
White recently told Fox Sports that the organisation would likely strip McGregor of his title if he refused to fight again soon.
"Conor has said that he's thinking about coming back in September. If he comes back in September that's almost two years - that can't happen. It's not fair to everybody else," White said.
"I love Conor, respect Conor, love everything he's done for the company, everybody knows that, I say it all the time (but) the belt would have to move on," he explained.
Neither White, the UFC nor McGregor's representative have responded to a request for comment.
(Reporting by Philip O'Connor; Editing by Christian Radnedge)
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