The Feyenoord manager is the favourite to succeed Klopp at Anfield.
Manchester City boss Pep Guardiola says he does not "spend one second" thinking about referees as he prepares to face Nottingham Forest following the relegation-threatened club's stinging criticism of match officials.I don't spend one second (thinking) about referees, especially when we lose."
It was once known as plain old closing down, but coordinated pressing schemes have become one of the key tactical battlegrounds at the sharp end of the Premier League.