While talks are ongoing, the pair will collide this summer once again for the WBA, WBC and IBF heavyweight titles.
Joshua surrendered his belts to Usyk last September with the Ukrainian producing a masterclass to win on points.
"It didn't go so well the last time, it's a tough ask, said McGregor when speaking to Sky Sports.
"AJ is a good guy and I wish him well. Usyk is a great guy as well and I hope for a good bout for both men.
"The heavyweight division is on fire at the minute. Good things are happening."
Wilder to return
The division received a huge boost following comments made by Deontay Wilder last week.
The American confirmed his return to the ring and according to the WBC president, he could be in line for another world title shot next.
That will all depend on Tyson Fury though. The British boxer said he will retire after his crushing win over Dillian Whyte but he is yet to vacate the green-and-gold belt.
Mauricio Sulaiman spoke to Planet Sport about the situation and said he will speak to the 'Gypsy King' after his vacation.
"Tyson Fury confirmed how great he is inside the ring and outside the ring he is also a hero," Sulaiman told Planet Sport.
"We're going to give him the time he needs to reflect, to relax, he just did the mandatory of the division - there's no hurry to pressure him or his team into making any decisions. We will be in communications, he's having holiday with his family.
"I'm not saying we will get him three months, there's no time limit right now I'm respecting the level of Tyson Fury, his private time with his family but we will talk in the near future certainly.
"We need to address the situation if he is retiring but at this time, we are just giving him the much deserved time to enjoy his holidays," added Sulaiman.