It is being reported that Jose Aldo has fractured a rib in training, putting his UFC featherweight title bout with Conor McGregor at the MGM Grand in Las Vegas on 11 July in doubt.

Aldo is believed to have suffered the injury in a sparring session in training on Tuesday morning, with the damage confirmed by later scans.

Brazilian MMA journalist Ana Hissa broke the news on Twitter, but there has not yet been any official confirmation from Aldo's camp.

UFC president took to Twitter last night and his two-word tweet, "relax everyone" would imply that he is confident that the fight will go ahead as planned.

There were separate reports yesterday that Aldo had suffered a training injury, though this was later denied by his coach Andre Pederneiras. Fight fans will be hoping for a similar development to the latest reports.

However, if reports are true, and with broken ribs usually requiring a six-week recovery period, the title fight would almost certainly be cancelled. That would leave the possibility of McGregor fighting a different opponent for an interim world title until is fit to face the winner of that interim bout.

It is believed the injury came about when one of Aldo's training partners slipped mid-kick and caught the Brazilian in the ribs causing the injury.

ESPN has reported that McGregor has not been informed of the injury or any postponement of the title bout.