Usyk, the former undisputed cruiserweight champion, beat Derek Chisora by decision on Saturday night as Joshua watched on.
AJ was shouting advice to his old amateur teammate Chisora throughout, a fact that can't have been lost on Usyk, especially in the unusual environment of a fan-free Wembley Arena.
The video shared by promoters Matchroom Boxing shows a victorious Usyk picking out AJ on the sidelines. "Anthony hello! How are you my friend?" asks the 33-year-old, as he shakes a raised fist at the 6ft 6in Brit.
"I'm coming Usyk!" replies Joshua, in a mock gravelly voice. Although as he's world champion, really it should be Usyk who's coming for AJ.
All fun and games between the pair for now, but there's every chance things could turn nastier in the future. Both boxers are signed with Eddie Hearn's Matchroom, which should make a contest easy to arrange.
But if Joshua gets past Kubrat Pulev on 12 December, his aim for 2021 will be to take on Tyson Fury in a unification mega-fight.
Usyk, who holds mandatory status with one of the alphabet governing bodies, has insisted he doesn't want 'step-aside' money to wait his turn and will push for his title shot.
"Usyk has been the WBO mandatory challenger for more than one year," explained his co-promoter Alexander Krassyuk on Sky Sports. "He has agreed to let AJ versus Pulev happen, with regards that the winner fights him next. This statement is still solid."
"Joshua has two options. One to fight me, the other one to vacate and to fight Fury." :eyes:@Usykaa sends a clear message to @AnthonyfJoshua that he does not want to wait for the planned undisputed fight with Tyson Fury before receiving his mandated shot- Sky Sports Boxing (@SkySportsBoxing) November 3, 2020
It's a sticky situation for Hearn, Joshua and Usyk. It looks tricky to give both heavyweights what they want in 2021, especially if the rumoured AJ-Fury agreement is a two-fight deal.
However Joshua-Usyk remains a good-natured rivalry for now, probably because it's hard to find anyone who dislikes Usyk. The quirky, charismatic southpaw - who also happens to be one of the greatest cruiserweights of all time - even shared a Five Guys burger with Chisora after 12 rounds of punching each other in the face.
While the scores on the night were close (115-113 twice, plus 117-12, all for Usyk) many believe the unbeaten Ukrainian won a bit more convincingly than that, after he weathered Del Boy's early storm.
Whether the supremely skilled Usyk has the sheer size to compete with super-heavyweights such as Joshua and Fury is the big question, along with whether he can cope with their incoming punches.
While AJ vs Fury remains boxing's biggest dream fight, a showdown between power-punching Joshua and the fleet-footed Usyk would definitely be one fight fans would welcome.
Featured image credit: PA Images
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