The Europa League and Europa Conference League group stages get under way this week, with several Premier League and Scottish Premiership sides involved.
Brighton, Liverpool and West Ham and Rangers all involved in the Europa League, while Aston Villa and Aberdeen take part in the Europa Conference League this season.
BBC Sport takes a look at the key things to watch out for.
Brighton heading into the unknown
There will be six teams making their Europa League debut this season, with Brighton one of them.