It's a rivalry that's been brewing since Jurgen Klopp and Pep Guardiola's days in the Bundesliga with Borussia Dortmund and Bayern Munich.
In total, the pair have faced off 14 times - with Klopp leading their head-to-head record by eight wins to five, with one draw. His record is even more impressive since they both headed to England - with Klopp only tasting defeat once in seven outings against Guardiola.
Despite that impressive résumé, Klopp has rarely threatened Guardiola's unparalleled record of success - watching on instead as the Spaniard secured back-to-back Bundesliga titles at a canter, as well as last season's Premier League title.