Former British boxing icon, now turned pundit Johnny Nelson, has given his take on why the Amir Khan vs Kell Brook fight is just pure speculation.

The former world champion, who now plies his trade with Sky Sports, shares the frustration of Brook with the obstacles put in the way by the Bolton camp.

Nelson, who is a major advocate for the Khan vs Brook match-up, believes that no such event will take place, however, he offered advice to the latter as he stresses that Brook must be kept busier to counter the effect of his age catching up to him before it takes a bigger toll as he turns 32 this Thursday.

"He's at a stage to his career where if he's going to peak it has got to be now, because any time after that you are going to go down hill," he said.

Nelson, on why he sees the fight falling through, said: "They have got the same promoter, but my personal opinion is I don't think it will happen.

"I keep hearing various excuses from Amir - and I'm a fan of Amir - but that's the only thing I don't get.

"I think Amir is an amazingly fast fighter - probably the fastest fighter I have ever seen live - and I just don't get why there is constantly an obstacle."

Elaborating on the issues that will prevent a possible fight, Nelson mentioned that Khan has labelled himself a 147-pound fighter, a weight in which he found himself to be over when weighing in in his last two fights, against Phil Lo Greco and Saul Alvarez respectively.

Brook, who struggles to slim down to this weight, could represent the biggest issue when trying to match-up these two for a high profile event.

Nelson, however, has stressed to Brook to stay ready and stay in peak physical shape, while also tipping him for potential victory if the fight were to ever go through.

"If I was Kell, I would hound Amir Khan, I'd publicly embarrass him every time he does any public appearance.

"The problem is, Amir is probably a bit more media savvy than Kell, he is a quicker talker he knows what to say and what not to say.

"Amir Khan will take the fight if he wants to take the fight. Nobody will pressure him.

"Brook can be made fight-ready quickly, in need be.

"Kell is in shape he's just come through a training camp, so I know he is in the gym.

"When he's not training, he is not training, but when he is training he is training hard. But actually after his last fight he was straight in the gym again, he has ticked over. He is gym fit

"Kell is one of those fighters after a fight he wouldn't be gym fit. He'd just disappear but now he's actually stayed in the gym."

It remains unlikely that a match-up between these two will ever go through, however, if it ever does, it should be right to assume a spectacular showing between two top competitors.