Gary 'Spike' O'Sullivan will fight reigning WBO light middleweight world champion Jaime Munguia in January with the unbeaten Mexican making his debut at middleweight.

Munguia (34-0, 27 KOs) is untested at 160 pounds and O’Sullivan (30-3, 21 KOs) should offer a stern test on 11 January at The Alamodome in San Antonio, Texas.

O’Sullivan has been without a fight since March’s super welterweight over Khiary Gray after visa complications scuppered an August bout with Diego Adrian Marocchi in Boston.

Nevertheless the Cork fighter, who is more than comfortable at 160lbs, is confident that he can make up for lost time against Munguia and he insisted that he’s never been more motivated for a fight.

"For me it's a dream come true to fight the undefeated champion of the world and the number one ranked fighter in the world," O'Sullivan said.

"It makes it even better that he's Mexican. I grew up watching the great Mexican champions and to get the opportunity to fight Jaime is an honor. I will leave no stone unturned in my preparation for this fight.

"I can't recall feeling more motivated by any other fight in my career thus far. I believe this fight will be a war that the fans will talk about for many years to come."

O’Sullivan’s manager and trainer Packie Collins revealed that he’s long been preparing his man for a showdown with Munguia.

"Spike always knew in the back of his mind that one day he would have to fight Jaime Munguia," he said.

"We have gone through every different scenario of how to approach this fight if it were to take place. I would like to thank both Jaime, Golden Boy and Murphy's Boxing for handing Spike this huge opportunity.

"Come 11 January, Spike will be ready for whatever Jaime Munguia turns up on the night of the fight."