Sporting Lisbon reported 10 coronavirus positive tests, including eight players and manager Ruben Amorim,
Manchester United signed Bruno Fernandes for an initial fee of around 47 million pounds ($61.2 million).
Chelsea made it four wins from four matches in Group L by edging out a spirited BATE Borisov 1-0 in Belarus.
AC Milan will be a stiff challenge for a less-than-impressive Arsenal.
Cristiano Ronaldo's free-kick levelled the game in normal time before Alvaro Morata met James Rodriguez's cross deep into stoppage time to complete a dramatic fightback from Real Madrid
Premier League champions Leicester City defeated Belgium's Club Brugge 3-0 in their Champions League debut in Bruges on Wednesday.
Spanish giants Real Madrid will start their title defence against Cristiano Ronaldo's old club Sporting Lisbon, while English champions Leicester City will make their debut in the European showpiece event
Manchester United legend Ryan Giggs was taken aback by Cristiano Ronaldo's brilliance when he saw the Portuguese winger play for the first time during a friendly between the English giants and Sporting Lisbon in 2003
Martunis, who survived a Tsunami in 2004, has signed with Cristiano Ronaldo's first big club - Sporting Lisbon.
Bengaluru FC will face confident Sporting Clube de Goa in the second semi-final of the Federation Cup on Friday.