The British Olympic Association’s (BOA) Chairman Hugh Robertson said it would be “tragic” if other members of the country’s Olympic 4x100m relay team were stripped of their silver medals over Chijindu Ujah’s anti-doping rule violation. The Athletics Integrity Unit said on Thursday Ujah has been provisionally suspended for allegedly breaching anti-doping rules at the Tokyo Games after he had returned an Adverse Analytical Finding (AAF) from a test carried out during the Olympics. It listed the prohibited substances detected as Ostarine and S-23, both classified by world anti-doping organization WADA as a selective androgen receptor modulator (SARM) with effects similar to anabolic steroids. Ujah’s relay teammates were Zharnel Hughes, Richard Kilty, and Nethaneel Mitchell-Blake, whose medals will also be at risk if the positive is confirmed. “It is absolutely tragic for the other members of the relay team but those are the rules,” Robertson told The Times newspaper on Friday. …