The Turkish Super Lig club will welcome Hearts to the Papara Park for a matchday three encounter on Thursday night.
Onuachu sustained an injury in Trabzonspor’s 4-2 victory over Finnish side KuPS last Thursday.
“Tomorrow will be a bit early for Mustafa, early for his return tomorrow. For Onuachu, we could say maybe the Rizespor match,” Reis told a press conference.
