Dream Team VI defender Chizoba Amaefule has explained that the national team are conceding goals in the second half at the ongoing Africa U-23 Cup of Nations because they are leaving too much space for the opponents to exploit.<br /><br />However, the Dolphins star has refused to write off the chances of the Nigeria Under 23s qualifying for the semi - finals of the competition, with a make or mar clash against Algeria still to come on Saturday.<br /><br />&ldquo;The problem is that we are not marking well in the second half of the games because when you don<span class="body1">&rsquo;t mark well they can attack the midfield and the defense will be in problem, </span>&rdquo; said Chizoba Amaefule to <b>allnigeriasoccer.com</b>.<br /><br />&ldquo;The midfielders are not in the game and I just don<span class="body1">&rsquo;t understand what is happening.<br /><br /></span>&ldquo;I believe we will beat Algeria and qualify for the semi - finals. <span class="body1"></span>&rdquo;<br /><br />The former Al-Markhiya SC defender went the distance against Egypt , with coach Samson Siasia preferring him ahead of Kano Pillars youngster Bello Zaharaddeen in the starting XI.<br />