Gonzalo Higuain's deflected effort in the 59th minute sealed a 1-0 victory for AC Milan over Luxembourg side F91 Dudelange.
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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.