Barcelona will be without teenage sensation Lamine Yamal for their Champions League opener against Newcastle United on Thursday, with the winger sidelined by a groin injury.
North London rivals Tottenham and Arsenal both kicked off their respective Champions League campaigns with wins on Tuesday night, although in very different styles.
Juventus and Borussia Dortmund played out a thrilling 4-4 draw in their first Champions League group stage match on Tuesday.
Borussia Dortmund head coach Nico Kovac has urged his players to deliver a statement performance when they face Juventus in the Champions League league phase on Tuesday night in Turin.
Chelsea's preparations for their Champions League opener against Bayern Munich have been dealt a blow as injuries and illnesses continue to limit Enzo Maresca's options.
Federico Chiesa has been left out of Liverpool's Champions League squad, but the Italian winger has shown determination to fight for his place after Arne Slot explained the difficult decision.