The Europa League game between F91 Dudelange and FK Qarabag was temporarily halted when a drone was flown over the ground.
A delay of more than 15 minutes followed the appearance of the drone, which was carrying a flag.
Players from Luxembourgish side Dudelange and Qarabag, of Azerbaijan, tried to bring the drone down by kicking the ball at it.
The incident happened in the first half of the match, which Qarabag won 4-1.
Bosnia-Herzegovina goalkeeper Asmir Begovic, who is on loan from English Premier League side Bournemouth until January, was in goal for Qarabag.