Haroon is the younger brother of former WBA and IBF world light-welterweight champion Amir, who will be headlining the show in Sheffield when he takes on Julio Diaz.
While Amir is looking to get back into world title contention, 21-year-old super-flyweight Haroon will start his career in the paid ranks against Bulgarian Stefan Slavchev, who has won three of his 10 fights and will be making his fifth appearance in the UK.
"I really can't wait for the fight to come round now," Haroon told sportinglife.com.
"It was meant to happen in January and then it was moved to February but postponed again - but after thinking April was a long way off the time has gone over very quickly.
"Obviously making my debut on the same bill as Amir is a dream come true. Not only is he my brother, but he's my role model and my idol.
"If I can go on and achieve half of what he has done in boxing then I will have had a very good career.
"People will make comparisons, but the fact we fight at different weights I think will help take some of the pressure off me. But I want the fact that Amir is my brother to be an advantage - he's a huge help to me and someone I can always go to for advice."
Haroon had a distinguished ten-year amateur career which culminated in him claiming a bronze medal when he represented Pakistan at the 2010 Commonwealth Games in Delhi.
He was overlooked by the Team GB selectors in favour of Andrew Selby who he went on to beat in the quarter finals.
Turning professional was always on the cards for Haroon, although he did face some strong family opposition.
"It was an easy decision for me to make - but my mum wasn't too pleased!" he said.
"She took a lot of convincing. It was just a natural mother's reaction, not wanting to see her son get hurt. I think she thought having one professional fighter in the family was more than enough.
"She doesn't come to fights anymore but she always wants to know that we've come through OK so we have to ring her as soon as we get out of the ring.
"But I'm convinced I have made the right decision. Obviously it's going to be a lot different in the pros compared to the amateurs - no headguard, no vest.
"I'm changing the way I box so I plant my feet more to get off my shots and I've been getting plenty of good sparring to prepare me."
Haroon has seen big brother Amir become the world's best and would certainly like to follow in his footsteps.
"I've had plenty of chats with my team about what we would like to happen but it's going to be a case of one step at a time," said Haroon.
"I want to keep busy but there's no rush to get where I want to be. I'd like to win the English title, then the British, Commonwealth and European before thinking about a world title.
"Amir was only 17 when he won Olympic silver and after just a handful of pro bouts was fighting for a Commonwealth title.
"I'd rather follow the traditional route and step up one level at a time. Hopefully it will all work out."