Britain’s silver medal in the men’s 4x100 metres relay from the Tokyo Olympics could be stripped after sprinter CJ Ujah was provisionally suspended by the Athletics Integrity Unit for two banned substances.

An Adverse Analytical Finding showed up for Ujah, testing positive for investigational selective androgen receptor modulators ostarine and S-23, which are used as a male hormone contraceptive and as treatment for muscle wasting and osteoporosis.