With Andrea Pirlo returning to Juventus as their new head coach, Stats Perform News looked at other returning heroes and how they fared.
Paris Saint-Germain have been linked to Cristiano Ronaldo, but their priorities are elsewhere.
Chelsea have to achieve something that has never been done against Bayern Munich, while Lionel Messi's home form could be key for Barcelona.
Barcelona may have surrendered their title in LaLiga but Gennaro Gattuso is wary of the threat they will still pose to Napoli.
Barcelona head coach Quique Setien fended off more talk about his future ahead of a decisive encounter with Napoli.
Juventus-bound Arthur reportedly wants out of Barcelona ahead of schedule and Sergio Busquets hopes some common ground is found.
Chelsea face a tall order as they bid to come from 3-0 down against Bayern Munich, but Champions League comebacks are not so rare nowadays.
Lionel Messi and Cristiano Ronaldo will likely be key to Barcelona and Juventus' hopes of arresting their poor recent form.
Pierre-Emerick Aubameyang is reportedly close to extending his Arsenal contract.
Manchester City have had an "average season", but Real Madrid will not find things easy at the Etihad Stadium, Clarence Seedorf says.