After expertly dismantling St Johnstone on Saturday night, Celtic now turn their attentions to the toughest test of the season so far against Borussia Dortmund. The Bhoys visit last season’s Champions League finalists on Tuesday. Brendan Rodgers’ side are full of confidence and swagger after a nine-game winning run to kick off their campaign. However, the Germans present a big jump up in competition, and Celtic will have to be at their very best to hope for a positive result. The only concern heading into the match is the status of defender Cameron Carter-Vickers. Carter-Vickers has missed the…