Liverpool beat Brentford 2-1 on Saturday, but injuries to Dominik Szoboszlai and Jeremie Frimpong raised concerns before Tuesday's home game with Villarreal.
Roma beat Genoa 2-0 in Serie A, and Gian Piero Gasperini said he had no doubt his side would react after the 4-3 defeat to Real Madrid.
Napoli lost 1-0 away to Venezia in round seven, leaving them ninth on 10 points for now, and GOAL said it is their worst start since 2001-02.
Venezia won 1-0 against Napoli, with Akor Adams scoring and Filip Stankovic saving a Kevin De Bruyne penalty.
Massimiliano Allegri said his exchange with Kevin De Bruyne in Napoli's loss to Villarreal was a misunderstanding before the Serie A trip to Venezia.
Roma coach Gian Piero Gasperini said Manu Koné and Paulo Dybala will miss the home Serie A game against Genoa, with five regular starters unavailable.
