Conor McGregor posts a picture of his youngest son Rian, in St Tropez, and reveals who 'the big boss.

Conor McGregor, UFC superstar, has called Rian his 'big boss'.

As he and Dee Devlin were on holiday in South France, the Dubliner posted a photo to Instagram.

Insta caption: "The Big Boss"

McGregor is currently off the shelf as he works to get back to his full fitness following the horrible leg injury in the Dustin Pourier Trilogy fight at UFC 264.

They are currently staying with their three children, Conor Jr., Croia, and Rian on the millionaire’s yacht in the French coast city.

The 32-year old and Devlin, who were in Rome last month, visited the Sistine Chapel to Rian's Christening. They flew the whole family to Rome for the ceremony at Vatican.

Rian and Conor Jr., as well as his brother Conor Jr., have been suggested by the Dubliner before.

He revealed last May that he had been training his male offspring from the beginning to follow his example.

John Kavanagh, the head coach of SBG, flew out to St Tropez to meet The Notorious, Black Forge owner.

The famous coach posted the meeting on Instagram, sparking speculations about a possible return to the UFC.

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McGregor's coach suggested that they were discussing where the former lightweight kingpin would be returning to.

Kavanagh wrote a caption to an Instagram post that read: "So, which weight class?" All of them.

McGregor has yet to confirm a weight category and return date to UFC's Octagon.