Unfortunately, Romero did not hold up his end of the bargain on his first attempt.
Whittaker weighed in bang on the limit.
UFC 225 pay-per-view event is slated to go down on Saturday, June 9, 2018, at the United Center in Chicago, Illinois.The main card will air on pay-per-view at 10 p.m. ET while the preliminary card will air on FOX Sports 1 at 8 p.m. ET and the promotion's streaming service, UFC Fight Pass at 6 p.m. ET.
As a result, New Zealand-fighter Whittaker will have to wait to defend his title after last fighting nearly a year ago in July.More news: USA must stop separating migrant children from parents
Romero initially came in at 186lbs and was given an additional hour to get down to 185lbs for the much-anticipated rematch but he could only get as low as 185.2lbs, meaning he was ineligible to fight for the title.
But Whittaker has agreed to save the main event and face him in a non-title bout.
"We came here to fight for the title", Romero said after the ceremonial weigh-ins, where he received a chorus of boos from the local crowd "I came here for the title fight".
"This fight, as far as I'm concerned, I have 25 minutes to try to finish him - and I'm going to use every single second of those minutes to try to achieve that". It would make me upset if my opponent missed weight because I believe making weight is half the job; if you don't make 84.5 [kilos, 186lbs] then we're not in the same weight division. CM Punk comes in with a deeper grappling background than Jackson and that could set him up for the upset in a fight that is highly likely to have an early stoppage. I don't even know how that's [missing weight] a thing?