Celtic are flying and bang in form ahead of their Champions League showdown against Borussia Dortmund on Tuesday night. But with that comes added pressure because of the competition it creates within the squad and how the smallest of slip-ups can result in you losing your place. No one knows that better than Paulo Bernardo because he has had that ever since he moved to the club last summer on an initial loan deal. Last season, Bernardo had Matt O’Riley working his magic non-stop, added with Reo Hatate and then no one is playing in front of the skipper, Callum McGregor. But with O’Riley leaving…