Paris Saint-Germain will need to get out of their 'comfort zone' if they are to emulate the trio of clubs that have achieved European three-peats. Only Real Madrid (1956-60, 2016-18), Ajax (1971-73) and Bayern Munich (1974-76) have won three successive European Cup/Champions League trophies. PSG starts another UEFA Champions League title defence on Wednesday against Slovan Bratislava at the Parc des Princes. The team is not in the best possible form, taking just two points from three games in Ligue 1 and conceding six goals already. This lack of form may make their Champions League title defence even more challenging. They will need to improve their performance quickly to stand a chance of achieving their goal.