Floyd Mayweather Jr will face Manny Pacquiao in a long-awaited showdown before the end of his career, the unbeaten American's father has confirmed.

The 37-year-old has two fights on his Showtime television contract remaining, with the penultimate bout scheduled for May 2015.

Mayweather has continually evaded a meeting with long-term rival Pacquiao, recently accusing the Filipino fighter of requiring a payday late in his career in order to dismiss tax evasion charges.

As rumours of a bout between the pair continue to mount, Mayweather Sr has claimed a fight will take place next year and remains confident his son will improve on his 47-0 record.

"I'm pretty sure that if don't nothing else happen, I'm pretty sure he's gonna get Pacquiao, it's gonna happen," the 61-year-old coach told FightHype.

"Trust me. That fight's definitely gonna happen. It's a fight for the world, man, right there. It's the biggest fight that has ever been in life, so like I said man, that fight's gonna happen.

"I'm going to tell you right now, he never told me the fight's gonna happen, but I'm going to tell you, the fight's gonna happen. You mark my words. Pacquiao is tailor-made for Floyd.

"The world wants to see it and they'll want to see it again when Floyd beats Pacquiao. I'm pretty sure Floyd is gonna make it look where people are going to want to see it again, because I'm just saying, Floyd's gonna pick Pacquiao apart, man."

If Mayweather is unable to secure a fight with Pacquiao, Amir Khan is his next prospective opponent in the New Year.

Khan, who was in talks to face fellow Briton Kell Brook, has continued to call out Mayweather – who ducked a meeting earlier this year despite the 27-year-old winning an online pole to determine his next opponent.

But Mayweather's coach has stoked the fire between the two fighters, labelling Khan a "joke" before dismissing his challenge.

"He ain't gotta worry about no Amir Khan," he added. Amir Khan is a joke blowing smoke with no hope. He can't out-think Floyd on Floyd's worst day.

"I'm here to tell you that I'm going to be there and I'm going to make sure every time he throw a punch, he gonna get countered. He gonna get punished, believe me.

"You gonna see a whole lot of stuff you ain't seen before. You gonna see up jabs, split jabs, up and down, down and up, pull counters; you gonna see a lot of things where Floyd is gonna be hitting him from angles."