Dyantyi insisted he had not taken any banned substance and requested a B sample test.
Enyimba qualified 5-1 on aggregate and face Al Hilal of Sudan next month for a place in the group phase
Siasia was also handed a fine of 50,000 US dollars
With the Tokyo Olympics looming less than a year away, Kenya is confident it will avoid a repeat of the Rio Games controversy
Riyad Mahrez-captained Algeria became African champions a second time by beating Senegal 1-0 in the final July 21