Flick with Bayern Munich against Thomas Tuchel with Paris Saint-Germain (2020) In 2019–20, three German managers reached the semi-finals (Hansi Flick with Bayern Munich, Julian Nagelsmann with RB Leipzig and Thomas Tuchel with Paris Saint-Germain), the most by any single nationality to reach the last four in the competition's history. A record four German managers (Including East and West Germany) also reached the quarter-finals in twice: 1976–77 (Dettmar Cramer with Bayern Munich, Udo Lattek with Borussia Mönchengladbach, Walter Fritzsch with Dynamo Dresden and Friedhelm Konietzka with Zürich). 2020–21 (Hansi Flick with Bayern Munich, Jürgen Klopp with Liverpool, Edin Terzić with Borussia Dortmund and Thomas Tuchel with Chelsea). Referees Felix Brych has made the most appearances in the competition as a referee, having officiated 69 matches. Four referees have officiated two finals: Leo Horn in 1957 and 1962 Gottfried Dienst in 1961 and 1965 Concetto Lo Bello in 1968 and 1970 Károly Palotai in 1976 and 1981 Björn Kuipers officiated a record nine matches during the 2020–21 season. Gottfried Dienst is the only referee to have officiated the final of the European Cup/Champions League, the FIFA World Cup and the UEFA European Championship, with the 1961 and 1965 European Cup Final, and in the 1966 FIFA World Cup Final and UEFA Euro 1968 Final. The following referees have additionally officiated the final of both the European Cup/Champions League and the FIFA World Cup: Jack Taylor, with the 1971 European Cup Final, and in the 1974 FIFA World Cup Final. Sándor Puhl, with the 1997 UEFA Champions League Final, and in the 1994 FIFA World Cup Final. Pierluigi Collina, with the 1999 UEFA Champions League Final, and in the 2002 FIFA World Cup Final. Howard Webb, with the 2010 UEFA Champions League Final, and in the 2010 FIFA World Cup Final. Nicola Rizzoli, with the 2013 UEFA Champions League Final, and in the 2014 FIFA World Cup Final. The following referees have additionally officiated the final of both the European Cup/Champions League and the UEFA European Championship: Arthur Edward Ellis, with the 1956 European Cup Final, and in the UEFA Euro 1960 Final. Arthur Holland, with the 1963 European Cup Final, and in the UEFA Euro 1964 Final. Nicolae Rainea, with the 1983 European Cup Final, and in the UEFA Euro 1980 Final. Michel Vautrot, with the 1986 European Cup Final, and in the UEFA Euro 1988 Final. Markus Merk, with the