Nigeria international Godfrey Oboabona , 24, faces a lengthy spell on the sidelines with a knee problem.<br /><br />Rizespor have revealed that the central defender underwent an operation at Sports Athlete Acibadem Health Center in Fulya following a meniscus injury. <br /><br />Tests conducted before the Super Eagles star went under the knife suggest that there was also damage to the cartilage.<br /><br />Rizespor have refused to disclose the date the central defender is expected to return to full training.<br /><br />This season, Oboabona has suited up 8 times in the Super Lig, netting once.<br /><br /><br /><br />