Genk raced to a two-goal lead but Vukovic was beaten twice shortly after half-time to level the contest.

The Belgians, however, fired in three second-half goals to wrap up the victory ahead of the return leg in Denmark.

Vukovic had made a good near post save to deny Ante Erceg in the 46th minute, before Hjortur Hermansson bundled home a minute later from a goalmouth scramble.

Four minutes later scores were level when Vukovic was beaten by Kamil Wilczek's volley.

Tom Rogic was an unused substitute, while Daniel Arzani was absent, as Celtic drew 1-1 in their first leg at Suduva. Evan Ridley was an unused sub for the Lithuanian club.

Apostolos Giannou started and played 83 minutes as AEK Larnaca drew 1-1 at Slovakian club Trencin.

Awer Mabil was a 78th minute substitute as FC Midtjylland fought back from two goals down to claim a 2-2 draw at Malmo.

Alex Gersbach was an unused substitute as Rosenborg triumphed 3-1 over Macedonian club Shkendija.