However, a recent revelation changed the course of events. Whyte was found to have an 'adverse analytical finding' during a random anti-doping check, a claim he vehemently denies. The substance responsible for the finding remains uncertain. This unforeseen circumstance left Matchroom Sport with a dilemma: either cancel their second sold-out O2 event in less than a year or find a suitable replacement opponent.
While speculations circulated about possible matchups with Dereck Chisora or Gerald Washington, both slated to fight on the undercard, Joshua's opponent will now be Helenius. Despite the short notice, the Finnish boxer is a credible contender, boasting a professional record of 32 wins and four losses from 36 fights.
However, it's worth noting that Helenius recently suffered a first-round knockout defeat against Deontay Wilder, the same opponent Joshua is eyeing for a future showdown if he emerges victorious this weekend.
Helenius himself returned to the ring after a 10-month hiatus, securing a third-round victory against his compatriot Mika Mielonen on Saturday in their home country.
Reflecting on this newly-scheduled bout, Joshua expressed his thoughts, stating:
"This wasn't in the script. I respect Helenius and may I say, I respect any male or female who steps into the ring.
"I am laser-focused on the win. I can make steps forward to bigger and better things but the road map has a checkpoint, Saturday night. May the best man win."
Commenting on Matchroom Sport's official website, Helenius added:
"I am excited about fighting Anthony Joshua on August 12. I am a true Viking that is willing to face any challenge at a moment's notice.
"This is not an opportunity I was going to let slip away. I plan to make the most of it!."