Wing Dyantyi, 25, faces a four-year ban from rugby after he tested positive for three banned substances - metandienone, methyltestosterone and LGD-4033 - in July.
Hooker Ralepelle, 33, tested positive for the growth hormone Zeranol in January and faces the prospect of his career being over.
Khalid Galant, CEO of the South African Institute for Drug-Free Sport (SAIDS), told
Sport24 on Monday that Ralepelle's hearing has concluded and the decision by the tribunal "will in all likelihood be rendered by January".