10 minutes on the clock, 50 players to guess.
Remember to tweet your scores @FourFourTwo and share with your mates.
They're the two greatest managers in the world according to some, with three Champions League titles between them and another two finals lost.
Pep Guardiola and Jurgen Klopp have come to define their generation. In the past few years, they've dominated the Premier League too, winning the last four, too.
But it's the Champions League we're looking at today.
Can you remember the 25 most-played players in Europe's elite competition for each of them? Only one man makes the list for both...
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