Bayern Munich start their Champions League campaign Tuesday with a mouth-watering clash at Barcelona as the Bavarian giants confidently head into Europe having plundered reinforcements from Bundesliga rivals RB Leipzig.

While Paris Saint-Germain snapped up stars like Lionel Messi and Sergio Ramos and Manchester United finally signed Jadon Sancho, Bundesliga champions Bayern raided last season's German runners-up RB Leipzig for talent.