World Athletics governing body says improvements in testing would make it harder than ever for athletes to avoid being caught.
Diack, an 87-year-old Senegalese, led the International Association of Athletics Federations, renamed World Athletics, from 1999 to 2015.
Russian Olympic Committee President Alexander Zhukov says doping ban for Russian Olympic athletes has been lifted and the athletes' rights have been "fully restored."
Canadian tennis player Eugenie Bouchard, who earlier called Maria Sharapova "a cheater", reiterated her stance that the Russian star should not have been allowed to play after she was found guilty of using a performance enhancer.
In his report, WADA's Richard McLaren accused Russia of "state-sponsored" cheating that involved more than 1,000 athletes across more than 30 sports.
Russian President Vladimir Putin blames a political plot for the decision to ban Russian athletes from the Rio Olympic Games.
Russia could be banned from Rio's 2016 Olympic Games after the International Olympic Committee confirmed reports that Moscow conspired to conceal hundreds of positive doping tests.
France defender and Liverpool's player Mamadou Sakho risks missing Euro 2016 as UEFA probes him over doping test
International Tennis Federation says tennis player Sharapova still faces meldonium hearing despite new WADA guidance
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