When Jose Mourinho arrives at Anfield on Monday night it will be his first real taste of the intense rivalry between Manchester United and their fiercest rivals.
But while it may be his first game against Liverpool as United boss, Mourinho already has plenty of experience of taking on the Anfield club - and has developed quite the personal rivalry with their fans.
From his arrival at Chelsea in 2004 the Portuguese manager has always seemed to rub Liverpool up the wrong way, and he would love to stay in their bad books with a win on Monday.