Nigeria U23s manager Samson Siasia says the defense will not repeat the same mistakes that saw them conceding twice in the second half in games against Mali and Egypt.<br /><br />Indeed, in their final Group B fixture, goalkeeper Emmanuel Daniel kept a cleansheet for his first shutout at the Africa U-23 Cup of Nations. <br /><br />&ldquo;We have learnt our lessons. Two games in which the first half looked good and the last half didn&rsquo;t, &rdquo; said Samson Siasia.<br /><br />&ldquo;We made our corrections and you can see from how we played in the last game.&rdquo;<br /><br />Siasia has claimed that Golden Eaglets sensation Victor Osimhen has had little or no game time at the competition because he doesn&rsquo;t want him to get awed by the occasion. <br />