Alvaro Negredo claimed a hat-trick and Sergio Aguero also struck twice as City made sure of at least second spot in Group D.
Pellegrini said: "Both played very, very well - and not only today but all season.
"Aguero is in a great moment, not only because he's scoring, but whole team is playing in an offensive team and that's important.
"We scored five goals and had five or six chances more."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball