The ground-breaking work was carried out by a US scientist following British research into tendons.
But geneticist Professor Marios Kambouris, of Yale University School of Medicine, Connecticut, has refused to name the club or players.
He said: “There were good genes, things positively affecting performance, such as better aerobic respiration, giving them more stamina.”
The tests, based on tendon rupture studies at the Centre for Sports and Exercise Medicine in London, aim to help clubs to manage the risk of injuries to star players.
But there are fears it may lead to weaker, higher-risk players being weeded out.
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