The former world sprint champion Tyson Gay will return from a one-year doping suspension at next month's Lausanne Diamond League meeting.
The US record holder was suspended after a 2013 positive test for an anabolic steroid.
He will race American rival Justin Gatlin, who served a four-year doping ban, and Frenchman Jimmy Vicaut over 100 metres at the July 3rd meeting.
The US Anti-Doping Agency said last month that Gay, the world's joint second fastest man, had accepted a one-year suspension backdated to June 23, 2013 after offering what it termed substantial assistance in his case.
He also returned his silver medal from the 4x100 metres relay at the 2012 London Olympics.
Normally athletes receive a two-year suspension for their first doping offense but under anti-doping rules the ban can be reduced for substantial cooperation.