Joshua will make his American debut on June 1 at New York’s Madison Square Garden.
The Brit is out to defend his WBA, WBO and IBF heavyweight belts after negotiations broke down with Deontay Wilder over a huge unification bout.
Dacres last sparred Joshua in the build-up the his title fight against Joseph Parker.
But he has helped again ahead of the Miami training camp, which is set up just 30 miles from rival Miller.
Dacres won the 2017 England Boxing Elite National Championships and is currently on the road to turning professional.
He has recorded a win over Mihai Nistor – who knocked Joshua out in 2011.
But he also suffered a defeat to Daniel Dubois.
Meanwhile, Joshua’s promotor Eddie Hearn is excited for his star to make his debut Stateside.
However, he has warned of some key differences, especially compared to a Wembley showdown.
“So much will be different and new for AJ. It’s not just about the five-hour time difference,” Hearn said.
“It’s about the rules, the gloves, the way the commission works in New York and the way they want hands wrapped over there.
“It’s about the changing rooms at the venue, the ring walk and how all the publicity and press conferences will work in a fight week which will be huge and very noisy.
“So the aim is to get well settled in with plenty of time in advance and to have a great camp before going to New York for the build-up and the fight.
“We can’t just turn up at Madison Square Garden and walk out like we would at Wembley.
“Miller will be based in Florida too, which could be interesting. He’s had a lot to say already and will surely cause a lot of commotion as the fight gets nearer.”
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