Amir Khan has come out this week and said talks are in process with boxing superstar Manny Pacquiao.
There is no doubt that a fight between the former stablemates, who fought under Freddie Roach out of the Wildcard gym, would be a big fight.
It is unclear what Pacquiao's next move will be after being nullified by Floyd Mayweather in a dull bout earlier this year.
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Dull is something that a fight between the old sparring partners will not be, as both fighters naturally come forward and don't take a backward step or fight defensively, like Mayweather.
Khan has also not ruled out a fight with the world's pound-for-pound best fighter Floyd Mayweather, even though the undefeated boxer retired after his 49th win at the weekend.
The Bolton fighter was disappointed that the American fought Andre Berto in Las Vegas on Saturday instead of giving him the nod. It is clear that this bout is the one Khan wants and is his ultimate goal.
The British welterweight hasn't fought since May when he beat Chris Algieri and has dismissed a potential fight against Ruslan Provodnikov by telling Sky Sports, "I don't know anything about it, Al Haymon (manager) has not even mentioned that fight to me. But the Manny Pacquiao fight seems more likely to happen."
"It's a good fight for me. We know each other quite well, we've done up to 100 rounds of sparring. But I think it is a good time to catch Manny now, I think it would be a huge fight."
There may be a bit of bad blood between the two camps if the fight does go ahead.
Khan split from Pacquiao's trainer and mentor Freddie Roach after losing to Lamont Petersen and Andy Garcia three years ago.
At the time, the 28-year-old claimed that Roach was spending too much time with his star boxer, Pacquiao.
On Mayweather, Khan said: "I'm obviously very upset I didn't get the fight. Who knows, he might come back for the 50th fight, I can't see him retiring. I know what Floyd Mayweather is like: I have spent time with him, I've been in the gym with him, he's a guy who can't stay in one place."
"So I really believe he will come back for that 50th fight, and I really think he will go for that Amir Khan versus Floyd Mayweather fight."