A 20-year-old Blidworth man is thought to be the third UK person to die after allegedly taking part in the Neknomination drinking craze.
Tests are being carried out following the death of Bradley Eames, whose body was discovered last Monday.
Bradley who worked as a barman at the After Dark nightclub in Mansfield, is reported to have drunk the equivalent of 30 shots of gin on an Internet video and challenged friends to outdo him.
Bradley had been a regular player for Newark Rugby Club, but had not played recently due to a back injury
A statement from the club said: “Sad news this week with the sudden passing away of former Newark player Bradley Eames.
“Brad was Captain of our successful 2010/11 U18s side that went on to win the NLD Cup.
“He quickly progressed to our 1st XV but suffered from a back injury that restricted his playing days.
“He will be sadly missed by all that knew and played with him. Our thoughts go out to his family.”
Police said a post mortem examination had proved inconclusive. Further tests will be carried out to find out how he died.
The spokesman added: “We are aware there is a video of him taken four days before his body was discovered at an address in Sneinton.
“We cannot link that to his death at this stage.”