But promoter Eddie Hearn was forced to rubbish reports that Joshua had signed to fight Martin Bakole or Deontay Wilder next.
And Joshua will have his eye on facing the winner as well as Zhang and German Agit Kabayel, 32, who fight for the WBC interim belt the same night.
But Wilder is plotting a comeback fight this year as he hopes to salvage the fight with Joshua, 35.
ANTHONY JOSHUA has SIX different opponents lined up for his next fight - if Tyson Fury remains retired.
"Fury, still obviously the two AJ most wants to fight, Fury and Dubois, that's it.
