Napoli wasted a number of big chances in their stalemate with Genk and boss Carlo Ancelotti acknowledged more cutting edge was required.
Arkadiusz Milik missed three glorious first-half chances as Napoli played out a 0-0 draw with Genk in Wednesday's Champions League clash.
Erling Haaland revelled in his memorable hat-trick, which led Salzburg to a 6-2 rout of Genk on Tuesday.
Salzburg talent Erling Haaland got a hat-trick on his Champions League debut on Tuesday. We look at who else has achieved that feat.
Erling Haaland became only the eighth player to score three times on their Champions League debut as Salzburg thrashed Genk.
Red Bull Salzburg striker Erling Haaland became only the eighth player to ever score three times on their Champions League debut.
The Champions League proper returns for 2019-20 on Tuesday, with Lionel Messi hoping to equal a record set by Real Madrid great Raul.
Liverpool faced Napoli in the Champions League last season, and the holders have been drawn against Carlo Ancelotti's side once again.
Paris Saint-Germain and Real Madrid will meet in the group stages of the 2019-20 Champions League.
The road to Istanbul started with the draw for the group stage of the Champions League, which was made in Monaco on Thursday.