The Bolton boxer, 32, has been training in San Francisco with Virgil Hunter preparing for what could be the toughest fight of his career.
Crawford is renowned as one of boxing's best pound-for-pound fighters – but Khan is clearly taking the prospect seriously.
The British star, a silver medallist in the 2004 Olympics in Athens, shared a snap of himself looking ripped ahead of the April 20 showdown at Madison Square Garden in New York.
Khan captioned the image: "Shaping up well. Over 5 weeks out. Get ready. #April20 #NYC #MSG #BTsport #ESPNppv for tickets click bio…."
Now in the latter part of his career, Khan is looking to become a world champion one last time – taking on undefeated WBO world welterweight champion Crawford.
Crawford has gone 34-0 with 25 KOs during his illustrious career so far.
Those wins have included victories over the likes of Yuriorkis Gamboa, Ricky Burns, Viktor Postol and Jeff Horn, the man who beat Manny Pacquiao in 2017.
Earlier this month, Khan was involved in a hilarious back-and-forth with Tyson Fury – after the Gypsy King revealed he would take him on next.
But Khan hit back, hilariously saying: “I find that quite strange really. I don’t want to be in the ring with Tyson Fury, he’s huge compared to me.
“Maybe he’s trying to say that maybe I’m looking big, I’m looking strong.
“I don’t know why he would mentioned my name. Maybe he knows that I’ve got a big fight coming up. I don’t know, I need to ask him.”
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