The Europa League game between Dudelange and Azerbaijani club Qarabag had to be briefly suspended after a drone flew over the field.
AC Milan came from behind before stepping on the gas to pull away from F91 Dudelange for a 5-2 Europa League win on Thursday.
Gonzalo Higuain's deflected effort in the 59th minute sealed a 1-0 victory for AC Milan over Luxembourg side F91 Dudelange.
Celtic put part-time Lincoln Red Imps in their place with a 3-0 Parkhead win that set up a Champions League third-round qualifying match with Astana.
Brendan Rodgers' first game with Celtic ended in a humiliating 1-0 loss to Gibraltar's Lincoln Red Imps in the first leg of their Champions League tie
Celtic eased through to the Champions League third qualifying round with an emphatic 4-0 win over KR Reykjavik at the BT Murrayfield stadium in Edinburgh.
St Patrick's were denied a shock Champions League victory over Legia Warsaw after conceding a stoppage-time equaliser in the first leg of their Champions League second qualifying round in Poland.