US distance runner Alysia Montano believes proven dope cheats should be banned from competing at the Olympics - including probable track and field teammates Justin Gatlin and Tyson Gay.

The 29-year-old 800m and 1,500m star is one of the biggest victims of the Russian doping scandal that has rocked world athletics.

Montano estimates she has been robbed of four medals by rivals who later failed drug tests.