Milan win at Celtic, Alkmaar stun Napoli, Spurs and Arsenal win

Soccer Football - Europa League - Group F - Napoli v AZ Alkmaar - Stadio San Paolo, Naples, Italy - October 22, 2020 AZ Alkmaar's Yukinari Sugawara in action with Napoli’s Lorenzo Insigne and Mario Rui REUTERS/Ciro De Luca

STOCKHOLM (Reuters) - AC Milan withstood a late onslaught to beat Celtic 3-1 and AZ Alkmaar overcame the loss of 13 players with positive COVID-19 tests to secure a shock 1-0 win at Napoli as the Europa League group stage got underway on Thursday.

London sides Tottenham Hotspur and Arsenal also made winning starts as did fellow Premier League club Leicester City.