David Wagner can already see a change in Manchester United under "top manager" Ralf Rangnick.
Thomas Tuchel has insisted Chelsea can cope without injured "Superman" N'Golo Kante.
Liverpool manager Jurgen Klopp was delighted with the way his much-changed side dealt with AC Milan in the San Siro to set a new record by becoming the first English club to win all six Champions League group matches.
AC Milan coach Stefano Pioli is keen to restore the club's proud European pedigree but admits he is not looking beyond their Champions League encounter with Liverpool.
Pep Guardiola has warned that Kevin De Bruyne will need to fight to win back a regular place in the Manchester City side.
Pep Guardiola felt his Manchester City team made a real statement as they came from behind to beat Paris Saint-Germain and reach the Champions League last-16.
Liverpool manager Jurgen Klopp hailed Thiago Alcantara's "thunderball" goal which set them on their way to a 2-0 victory over Porto and a fifth successive Champions League win.
Barcelona goalkeeper Marc-Andre ter Stegen says the changes new coach Xavi has made since arriving are clear after Tuesday's draw with Benfica.
Michael Carrick believes Manchester United's players showed their character as they delivered a 2-0 win over Villarreal in the first game since Ole Gunnar Solskjaer's sacking on Sunday.
Former Manchester United midfielder Paul Scholes believes caretaker boss Michael Carrick, assistant Mike Phelan and first-team coach Kieran McKenna should have left the club with Ole Gunnar Solskjaer, saying he would be "embarrassed" to be staying on.