Defending champions Liverpool have lost the opening match of their new Champions League campaign.
The Reds went down 2-0 to Napoli on Tuesday night as Dries Mertens and Fernando Llorente scored late goals for the Italian side.
Elsewhere, Marc-Andre ter Stegen saved a penalty as Barcelona held Borussia Dortmund to a goalless draw.
Chelsea's return to the Champions League saw Valencia claim a 1-0 victory at Stamford Bridge.

Mexico bounce Czechs out of World Cup with win
South Africa beat South Korea to reach World Cup knockout stage for first time
Qatar’s Assim Madibo gets 5-game ban for injuring Canada's Ismael Kone
Morocco earn comeback win over Haiti to reach last 32 as group runners-up
Brazil heads into World Cup knockouts with win over Scotland
