This is concerning:
https://www.usatoday.com/story/sports/soccer/2021/02/04/germany-bars-liverpool-from-coming-for-champions-league-game/43373521/Germany will not allow Liverpool into the country to play a Champions League game at Leipzig on Feb. 16 because of border restrictions imposed over new variants of the coronavirus.
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Germany is blocking most arrivals of non-residents from Britain to restrict the spread of new variants of the virus. If the travel restrictions — which don't contain any exemptions for sports — are extended beyond the current expiry date of Feb. 17, Manchester City’s first-leg trip to play Borussia Mönchengladbach on Feb. 24 could be affected.