Jurgen Klopp, 50, is the manager of Premier League football club Liverpool.
The boss, originally from Stuttgart, West Germany, gave a press conference yesterday claiming that he would quit as manager if he doubted Liverpool could beat Manchester United.
The clubs are set to go head to head this afternoon, and kick off is at 12:30pm. The match will play on Sky Sports Premier League and Sky Sports Main Event.
Manchester United is headed up by Jose Mourinho, 54, from Portugal. How much are the rival managers each worth?
According to website Celebrity Net Worth, Jurgen Klopp has a net worth of $20 million, or £15m, and a salary of £4.5m.
Jose Mourinho, on the other hand, has a net worth of $50 million, or around £38m, and a salary of about £20m.
Their illustrious careers began in very different ways, however.
Klopp began as a defender for FSV Mainz 05, a German football club, from 1990 to 2001.
He then went on to be appointed as the club’s manager, and kept the position for seven years – during which the team qualified in the 2005 to 2006 UEFA Cup.
Klopp then went on to work for Borussia Dortmund and was named German Football Manager of the Year in 2011, and 2012. He has worked at Liverpool since 8 October 2015.
Mourinho, however, originally worked as a PE teacher. However, he quickly changed career and became a youth team scout.
Later he coached at União de Leiria and Benfica. He has managed Chelsea twice, and been the boss at Manchester Unuted since 27 May 2016.
Do you know how much Welsh football star Gareth Bale is worth?
The 28-year-old plays for Real Madrid, but is currently injured – meaning he may miss out on the World Cup.
Celebrity Net Worth states that the young British player is worth £84m.
The World Cup next year is set to be held in Russia.