Saturday&rsquo;s game between Philadelphia Union and D.C. United at RFK Stadium will be the 300th appearance in the MLS for skipper Brian Carroll.<br /><br />Philadelphia Union center - back and USA youth - teamer Amobi Okugo has showered accolades on Brian Carroll, calling him a great player.<br /><br />&ldquo;We call him the iron man. The amount of running he does game in and game out is amazing.<br /><br />&ldquo;He&rsquo;s one of the more underrated players in the league, but he doesn&rsquo;t really care.<br /><br />&ldquo;He just goes about his business and that&rsquo;s why he&rsquo;s lasted longer than some other guys,&rdquo;Akugo told <b>mlssoccer.com</b>.<br /><br />Amobi Okugo , 22, has netted 3 goals in 29 appearances in the ongoing season.<br /><br />Photo Credit : philadelphiaunion.com<br />