Ashley Young's unfortunate own goal denied Everton a sixth win in eight matches as Brighton snatched a late 1-1 draw at Goodison Park.
Erling Haaland got back on the scoresheet as Manchester City returned to winning ways with narrow 2-1 win over Brighton.
Brighton forward Danny Welbeck admits he was booed by his family on his England debut.
Brighton head coach Roberto De Zerbi believes a first European tie can help give the club an "upgrade" – but warned it must not change their DNA.
Brighton have signed forward Ansu Fati on a season-long loan from Barcelona.
Moises Caicedo is officially on his way from Brighton to Chelsea for an initial fee of R2.4 billion, with potentially more in add-ons.