The Filipino senator has chosen to face the Briton over a fight with Australian Jeff Horn and had initially agreed a date of April 23.
Due to time constraints, Koncz has now confirmed a new date of May 19 (a Friday) is being pitched to both fighters this week.
“We decided to move it to May 19 here and May 20 in the United Arab Emirates so we’d have time to promote it properly and make it a huge success,” Koncz told Yahoo Sports.
“I have to talk to both fighters to get them to approve going in May instead of in April. I don’t think that will be any problem.”
Khan, 30, was selected following a public vote by Pacquiao on social media, which Koncz revealed brought a surprising geographical result.
“When I saw Amir ran away with it, I figured most of the votes from from England and a lot of them came from the (UAE), but they told me that 86 percent of them were from the U.S.,” he explained. “That meant a lot. Obviously, Amir’s a big name in the U.S., too, as well as in England and people saw it for what it is: A toss-up fight against two fast-handed guys.”
On choosing a Friday night (US/UK) slot, Koncz added: “We just want to do the best and the biggest fight we can, and this makes a lot of sense for so many reasons.
“We’ll be able to properly promote it and while it will be a Friday in the U.S., it will be a Saturday there. We were going to do it originally on a Sunday there, but that’s the start of their work week and we didn’t feel at the end of the day that would make as much sense. Their weekends are Friday-Saturday and putting the fight on Sunday when everyone was going back to work seemed like it might be a problem.
“Friday is a different night, but remember how big the Friday Night Fights used to be. We have the time now to promote it properly and I think we have the right fight, so I think it will do well.”