Five stars face their former teams in the group stage of the Champions League.
In Group F of the group stage, dubbed the "Death Group", Barcelona play alongside Inter Milan, Dortmund and Slavia Prague.
- Chilean Alexis Sanchez, who moved a few days ago to Nerazzo, will face his former team Barca, who played him between 2011 and 2014.
- Ousmane Dembele, who moved to Barça in 2017, played in Dortmund in 2016-2017.
- Dortmund striker Paco Alcacer, who moved to Barcelona from 2018, stayed in the club from 2016 to 2019.
In Group E, which includes Liverpool, Napoli, Belgium's Genk and Salzburg, Senegal's Sadio Mane, Liverpool's top scorer from Southampton in 2016, faces his former club Salzburg from 2012 to 2014.
The first group, which includes Real Madrid, Paris Saint-Germain, Belgian club Brugge and Galatasaray, will face Argentine winger Angel Di Maria, who moved to Manchester United in 2015, the Royal, who previously wore his shirt between 2010 and 2014.