John Obi Mikel was impressed with the goal scored by Spain international Diego Costa in Chelsea<span class="st">&rsquo;s entertaining 2-2 draw against Swansea City in the Premier League on Sunday, and delighted that his team maintained their unbeaten start to the season.<br /><br />Costa bicycle kicked the Blues level with nine minutes remaining, his fourth goal in the English top-flight so far this term.<br /><br /></span><span class="st">&ldquo;A tough game yesterday but determination and fight means we</span><span class="st"><span class="st">&rsquo;</span>re still unbeaten 🔵⚪ And that @diegocosta goal 👀🔥 #CFC, </span><br />&rdquo; tweeted the Chelsea number twelve on Monday. <br /><br />Mikel, 29, was not in Chelsea<span class="st"><span class="st">&rsquo;s traveling party to the Liberty Stadium and could not make his 250th career Premier League appearance. <br /><br />Igho Kingsley <br /><br />Photo Credit : chelseafc.com<br /></span></span><br /><br />