Aldo will face compatriot Marlon Moraes in a featured bout on the main card of this month's bumper UFC 245 event in Las Vegas in what will be his first fight at bantamweight following a career in which he reached the top of the mountain at 145lbs. 

McGregor, the man who ended Aldo's decade of dominance in the featherweight fold with a now legendary 13-second, one-punch knockout blow in late 2015, has shown support for his former foe following a slew of comments from fighters and analysts alike in which they express concern at Aldo's decision to drop down a division.

Reports suggest that Aldo still has around 16lbs to cut ahead of the December 14 tussle with former title contender Moraes but McGregor remains unconcerned and doesn't think that the legendary fighter is biting off more than he can chew.

"The first one is very troubling. Still don’t understand why Aldo is doing this," ESPN's Ariel Helwani tweeted in relation to the training photographs, prompting McGregor to spring to his former opponent's defence.

"I disagree here. He looks more than on top of it in my experienced opinion," the Dubliner wrote back.

"Well trimmed in advance, and naturally a lighter man now. This can only be done over a long length of time and with complete dedication. Respect!"