Chairman of the IAAF medical and anti-doping commission Dr Juan Manuel Alonso took to Twitter yesterday to refute the allegation that the world governing body ignored 150 suspicious blood tests.

German TV broadcaster ARD reported that a long-time member of the IAAF’s medical commission, whose identity has not been revealed, had a list of dozens of questionable blood values which were not followed up.

But Alonso defended the IAAF by saying that “blood samples taken before 2009 were thoroughly examined.”