Celtic’s upcoming Champions League opponents Dinamo Zagreb have sacked their manager Sergej Jakirovic according to reports in Croatia. Before the Bhoys surged to a 5-1 victory at home to Slovan Bratislava on matchday one, Dinamo were humiliated against Bayern Munich in a 9-2 defeat. Sportsk Novosti report that the Croatian champions have now parted ways with their boss in the wake of that result as well as poor showings against Trnje and Hajduk Split domestically. He’d only taken charge of the team for 60 matches, winning the Croatian top flight comfortably last term and guiding them through E…