Olympics 100m hurdles champion Brianna McNeal has been banned for five years for tampering with the anti-doping testing process, the Athletics Integrity Unit announced on Friday.

USA's Brianna Mcneal is disqualified during the Women's 100m Hurdles heats at the 2019 IAAF Athletics World Championships at the Khalifa International stadium in Doha on October 5, 2019. (File photo: AFP)

McNeal, 29, can still take part in the US trials for the Tokyo Olympics later this month while she appeals the ban, which is backdated to August 15, 2020, the AIU said in a statement.