Retired Algeria international Abdelhafid Tasfaout has admitted that the Nigeria Under 23s are a good side but tend to lose concentration in the second half.<br /><br />The former Algeria skipper has advised the Algeria Under 23 national team to do everything possible to stop the physical Nigeria side from scoring in the first half.<br /><br /><span class="body1">&ldquo;</span>Well, Nigeria is a good team that plays good football, but I also noticed they switch off in the second half. I wonder if they have a concentration problem. Is it a team that underestimates the others? &rdquo;&nbsp; Tasfaout told lebuteur.com.<br /><br /><span class="body1">&ldquo;</span>As against Mali, they almost got up, similar to Egypt where they were on the verge of losing, otherwise it must be a concentration problem, because physically, they were able to speed up the game towards the end. <br /><br /><span class="body1">&ldquo;</span>Against us, it will be a concentration for the whole game, we must not only defend well, but also try to surprise them. &rdquo; <br /><br />In a glorious international career spanning a decade, Abdelhafid Tasfaout featured three times against Nigeria, scoring once in his national team<span class="body1">&rsquo;s</span> 4 - 1 loss to the Super Eagles in a World Cup qualifier played in Lagos on July 3, 1993.<br />