The scandal marked yet another blow for the sport after former world 100m record holder Asafa Powell and Olympic 4x100m relay silver medallist Sherone Simpson also said they had both tested positive for the stimulant oxilophrine at last month’s Jamaican championships.
Gay said he had “put his trust in someone” and that he had been let down.
Gebrselassie said he “still could not believe” the weekend’s disclosures.
“It’s better to stop these problems from the root. You don’t know sometimes, [whether] in these kind of problems there is someone behind [the athlete’s doping],” he said.