Enyimba International F.C.
At the end of February 2012, Okonkwo completed a medical and was close to agreeing terms with Vålerenga Fotball, but as of the end of April 2012 was still contracted to Heartland. He signed on 22 November 2012 a two-year deal with Enyimba International F.C.., but the deal fell through and he signed with rivals Rangers in February 2013.