Sam Burgess and South Sydney Rabbitohs player Jason Clark in their jocks 

Sam Burgess wished his buddy Jason Clark a happy birthday on Tuesday. 

The 32-year-old shared an Instagram Stories post featuring a photo of the pair stripped down to their underwear in a hotel room. 

Both men, who were fellow South Sydney Rabbitohs players, had on just their jocks, and appeared to be during a past football tour. 

‘Happy birthday roomie! Sorry not sorry!’ Sam captioned the fun image of the pair, who beamed in the image. 

It comes after reports that former NRL superstar Sam choked out an instructor during a ‘kidnapping’ exercise for the upcoming season of SAS Australia.  

According to Fox Sports, he was competing in a hostage situation challenge when he put one of his ‘abductors’ in a head lock. 

As part of the challenge Sam and seven other celebrity recruits were thrown into the back of a car and driven at 100km/h by two instructors posing as kidnappers. 

According to the report, Sam hatched a plan to take control of the situation. 

He asked fellow ‘hostage’, Olympic sprinter John Steffensen to pull the handbrake, before attacking the driver.   

‘Burgess reached over and put the soldier in a head lock, choking him out, before climbing in to the driver’s seat and taking the wheel,’ the report claimed. 

‘The soldier was so damaged that an ambulance had to be called, leaving producers dumbfounded and the so-called SAS hard men red-faced.’ 

When contacted for comment, a Channel Seven spokesperson responded: ‘The new season of SAS Australia, coming soon to Channel 7 and 7plus, is the most gruelling course in the world to date. 

‘All participants will be pushed to their limits like never before.’