Sinister graffiti targeting Daniel Kinahan was sprawled across a wall in Dublin only hours before he was praised by a two-time heavyweight champion for organising the "biggest fight in British boxing history".
Kinahan, who heads a cartel involved in murders in Ireland and abroad, was given a "big shout-out" by Tyson Fury for his role in brokering the bout with Anthony Joshua.
The announcement came yesterday after it emerged that graffiti was scrawled on a wall near the embassy of the United Arab Emirates.
Kinahan has been exiled in Dubai since the start of the Hutch-Kinahan feud.
The threatening message is thought to be linked to a campaign against Kinahan as he attempts to legitimise himself as a businessman.
The words "Get cancer out of Dubai" - believed to be directly referencing Kinahan - was also sprayed in black paint on the wall in Ballsbridge.
The graffiti, which is believed to have been done late on Tuesday night, had been covered over last night.
In a video posted on his social media accounts yesterday, Fury announced a two-fight deal between him and unified world title holder Joshua.
"I'm just after getting off the phone with Daniel Kinahan," he told his followers, adding that "he's just informed me that the biggest fight in British boxing history has just been agreed".
Fury also gave a "big shout-out to Dan", who he said "literally got this done" and "over the line".
Fine Gael TD for Dublin-Rathdown, Neale Richmond, said it was "seriously concerning that Kinahan's role as a gangland boss responsible for the misery of drugs and murder in our country is being completely whitewashed by the competitors as well as the authorities in Dubai".
"Allowing Kinahan to hide his notorious gangland activities behind a veneer of a respectable boxing promoter cannot be allowed to happen," he added.
"I have called on our Tanaiste and Minister for Foreign Affairs Simon Coveney to make a direct appeal to the authorities in Dubai to hold Kinahan to account for his real activities.
"Ireland has a lucrative and growing relationship with the United Arab Emirates in a range of sectors as a large Irish diaspora also make their homes in emirates like Dubai and Abu Dhabi.
"This relationship cannot be compromised by a tacit approval of the gangland activities of Daniel Kinahan that run paral- lel to his boxing promotion."
Kinahan has previously been described in the High Court as running the day-to-day drug-trafficking operations of the international crime gang, with yesterday's announcement the latest high-profile involvement by him in global boxing.
Only last month, he was hired as the special adviser to a Middle Eastern sports company backed by the Bahraini royal family.
The group, KHK Sport, was founded in 2015 by Sheikh Khalid bin Hamad Al Khalifa, a son of Bahraini ruler King Hamad and the president of the Bahrain Olympic Committee.
A week later, MTK Global, which was part-founded by Kinahan but has spent recent years trying to distance itself from the mobster, announced it was going into partnership with KHK Sport to "bring the biggest fights to the Middle East".