Clarke, 27, suffered a double heart attack and stopped breathing in the dressing room during half-time in Leicester's Carling Cup tie with Nottingham Forest.

"He just stopped breathing, there was no pulse and then he turned white," Kisnorbo told the UK's Daily Mirror.

"We didn't think he was going to recover. It's something you see on TV but don't expect to happen in real life right in front of your eyes.

"I hope I never see anything like it ever again."

The game was abandoned after the incident with the Leicester squad too shaken to continue playing.

"Myself and Darren Kenton, who was also sitting alongside him, tried to prop him up," revealed Kisnorbo, who was this week recalled to the Socceroos squad for the Argentina game.

"At first we thought he'd fainted but it quickly became obvious it was much more serious."

The Irish defender - on loan to Leicester from Sunderland - is now in a stable condition in hospital.

Kisnorbo added: "Moments after he hit the floor, our physio Dave Rennie rushed in and called for a defibrillator.

"First he tried mouth-to-mouth but he still had no pulse, it was a scary moment for all of us.

"All I could think of at that moment was his family, and how they would feel if he didn't make it."