Karl-Heinz Rummenigge has sent Celtic a reminder of one thing that is going to feature heavily in the Champions League this season. Brendan Rodgers’ side have played two games so far in the competition and watched Celtic beat Slovan Bratislava 5-1 and suffer a 7-1 humiliation in Dortmund. However, it seems that Rummenigge, who won the European Cup on two occasions in his career with Bayern Munich, has pinpointed one thing that is so important now in UEFA’s flagship tournament that has never been as crucial as it is now. Dortmund’s seven goals against Celtic will play a ‘huge role’ in Champions…
