Despite Gareth Bale starting for the first time, it was on-loan Carlos Vinicius who made an impressive debut as Tottenham enjoyed a 3-0 win in their Group J opener.
Steven Gerrard's Rangers travel to Celtic for the first Old Firm derby of the season on Saturday, but their cross-city rivals could be without four key players due to coronavirus restrictions.
The UEFA Europa League group stage draw took place on Friday.
Celtic's Belgian defender Boli Bolingoli said he had not observed quarantine protocols after a trip to Spain.
Celtic were 13 points clear at the top of the table when the season was stopped due to the coronavirus pandemic in March.
Kenny Dalglish, 69, found he had the coronavirus after being admitted to hospital on Wednesday for treatment for a separate infection which required intravenous antibiotics.
"We are well aware of the economic realities and are very willing to play our part in recognising them," Celtic manager Neil Lennon said.
At Liverpool, Kenny Dalglish won eight English league titles, three FA Cups and three European Cups during a glittering 13-year stint as a player and in two managerial spells.
Celtic warmed up for Wednesday's Group C Champions League match vs Manchester City with a comprehensive 6-1 thrashing of Killie in the Scottish Premier League
Lionel Messi and Neymar were reunited with Luis Suarez from the start for the first time for Barcelona this season and took no time in getting reacquainted as all three were on the scoresheet in the Champions League match against Celtic