Real Madrid will be without Sergio Ramos and Marcelo for their Champions League opener against PSG, but star winger Eden Hazard is in line to start.
Liverpool were handed their first defeat of the season as late goals from Dries Mertens and Fernando Llorente saw Napoli hand them a 2-0 loss at San Paolo.
Manchester City begin their UEFA Champions League campaign with a trip to Ukraine where they face Shakhtar Donetsk for the third season in a row.
Barcelona and Borussia Dortmund played out a goalless draw in their opening Group F fixture of the 2019-20 Champions League at Signal Iduna Park.
Juventus and Atletico Madrid will begin their UEFA Champions League campaigns when they go head-to-head at the Wanda Metropolitano on Wednesday.
Real Madrid will be aiming to kick off their Champions League campaign with a victory, when they take on French champions PSG on Wednesday.
Bayern Munich will kickstart their 2019-20 UEFA Champions League campaign as they host Crvena Zvezda at the Allianz Arena on Wednesday
Mason Mount and Tammy Abraham will be making their UEFA Champions League debuts imminently when Chelsea take on Valencia at Stamford Bridge.
Roberto Firmino has returned to the starting lineup while Andrew Robertson is fit to start as Liverpool prepare to take on Napoli in the UEFA Champions League.
Jurgen Klopp is sweating over the fitness of Andrew Robertson ahead of Liverpool's UEFA Champions League opener against Napoli on Tuesday.