Tennis coach Nigel Sears believes his collapse at the Australian Open was caused "by a bad piece of sushi".
Sears, the coach to world number 17 Ana Ivanovic, fell while watching the Serb play in round three against Madison Keys on Rod Laver Arena on 23 January.
His son-in-law, men's world number two Andy Murray, was playing on a nearby court at the time of the incident.
"I really don't think it's likely my collapse was down to exertion," Sears, 58, told the Times.
"I know I was such big news at home, but it was a really strange one and I'm just really sorry I worried a lot of people unnecessarily.