UK rugby star Gareth Thomas has described coming out gay as the “scariest moment” of his life.

Thomas, who retired from rugby in 2011 following an injury, publicly announced he is gay in 2009.

In an interview with Channel 4 News to discuss an upcoming play about his life, Thomas recalled coming out to his rugby coach.

“We just sat down, we had a couple of cans and basically I told him why Gemma [Gareth's ex-wife] had left me and what I was going through,” he said.

“I told him [about] my attempted suicide and basically how my life was falling apart.”

“Probably the scariest moment in my life,” he added.

Thomas added that he'll keep telling his story as long it helps others.

“If I keep getting letters or if I keep getting messages from people who are still taking strength from my story, who are still finding it difficult and struggling, then you know what, then I'll keep doing what I do,” he said.

The play, titled Crouch, Touch, Pause, Engage, opens Thursday in Cardiff, Wales.