Nate Diaz has questioned Conor McGregor's vow to fight three times this year.
McGregor returned to the UFC in January to stop Donald Cerrone in just 40 seconds in his first fight for 14 months.
The Irishman has long claimed he sees 2020 as a three-fight "season" which he hopes will culminate in him being lightweight champion for a second time.
His second of three bouts could take place in July with Diaz and Justin Gaethje the frontrunners to be in the opposite corner.
McGregor and Diaz shared the octagon for two epic fights in 2016, winning one each to leave their rivalry finely poised.
And Diaz took to Twitter to say: "What happened to your season? I was already back in by now wtf."
The American was referring to his back-to-back fights against Anthony Pettis and Jorge Masvidal last year which were actually almost three months apart.
McGregor is also waiting for the outcome of current 155lb champion Khabib Nurmagomedov's title defence against Tony Ferguson next month.
UFC president Dana White remains keen on rematching McGregor and Nurmagomedov following their clash in 2018 which the Russian won by fourth-round submission.
"Khabib, if he wins – but I don’t know if Conor wants to wait for him. We’ll see what happens," White told TMZ. "Conor might not wait.
"They hate each other. If you think you’re going to do an interview with Khabib and he’s going to say great things about Conor McGregor , it’s never going to happen.
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