Arsenal 3-2 Vitoria Gumaraes
Arsenal maintained their winning start in Group F after defeating Vitoria Gumaraes 3-2 at the Emirates Stadium.
The visitors took a surprising lead through Marcus Edwards after eight minutes, before the Gunners were level in the 32nd minute through Martinelli.
Vitoria hit back four minutes later through Bruno Duarte's thumping finish, until second-half substitute Pepe stole the headlines by netting two superb free-kicks to seal victory for the Gunners.
Sevilla 3-0 Dudelange
Sevilla proved too strong for Dudelange after cruising to a 3-0 triumph at the Estadio Ramón Sánchez Pizjuán.
After a scoreless opening 45 minutes, Franco Vazquez netted a brace to put the hosts two goals up before El-Haddadi Munir rounded off the scoring in the final 12 minutes.
Celtic 2-1 Lazio
Celtic rallied from behind to defeat Serie A outfit Lazio 2-1 at Celtic Park.
Ryan Christie and Christopher Jullien got the goals for the Scottish champions to cancel out Manuel Lazzari's firs-half strike.
Getafe 0-1 Basel
FC Basel registered a vital win on the road after defeating Getafe 1-0 at the Coliseum Alfonso.
Fabian Frei got the game's only goal after 18 minutes, while the visitors also ended the game with 10 men after Kevin Bua received his marching orders in the 78th minute.
Rennes 0-1 CFR CluJ
Eintractht Frankfurt 2-1 Standard Liege
Dynamo Kyiv 1-1 Copenhagen
Malmo 2-1 Lugano
Trabzonspor 0-2 Krasnodar
Sporting 1-0 Rosenborg
PSV Eindhoven 0-0 LASK