Anthony Joshua had just confirmed on Monday that he will defend his world heavyweight titles against Kubrat Pulev in London on 20 June.
The British boxer posted a photo of himself wearing his belts on his Twitter feed with the words “June 20”.
Joshua regained the WBA, IBF and WBO titles with a unanimous victory over Andy Ruiz Jr in Saudi Arabia in December.
That victory saw the Brit avenge the first loss of his professional career in New York last June.
Joshua must face Bulgaria’s Pulev at the new Tottenham Hotspur Stadium in north London.
Pulev, who is Joshua’s mandatory IBF title challenger, left a scheduled meeting with the Brit in 2017 due to an injury.
The long-awaited British “super fight” between Joshua and Tyson Fury suffered a setback when American Deontay Wilder said he would trigger a clause in his contract for a third meeting with the new WBC champion.