Nigeria international John Ogu was absent from training on Thursday morning. <br /><br />This is the fourth consecutive day John Ogu will miss training after failing to recover from a left knee injury.<br /><br /><i>Allnigeriasoccer.com </i>earlier reported that Academica de Coimbra doctors had recommended that John Ogu should undergo urgent surgery. <br /><br />In fact, club medics want Ogu to provide a medical certificate issued at his former club Almeria of Spain. <br /><br />This is to enable them make proper diagnosis of the knee injury and possibly know his duration on the sidelines.<br /><br />John Ogu is desperate to play at the Fifa Confederations Cup in Brazil but there are no shortcuts for treatment of sports injuries. <br /><br />He has visited a specialist and fluids have been extracted from the knee.<br /><br />The midfielder might have aggravated the knee injury he picked up two years ago while defending the colors of Almeria.<br /><br /><b>Editor</b><br /><br />