Sir Alex Ferguson's side also boast England's most in-form player and perhaps Europe's most desired talent in PFA Player of the Year and Footballer of the Year Ronaldo.
He has scored an incredible 41 goals in all competitions this season and the stage appears set for a defining moment in his career when United take the field at the Luzhniki Stadium.
However, Avram Grant's brief is to devise a way of reining in Ronaldo and Carvalho knows that the responsibility cannot fall on just one man.
"I speak a lot with Cristiano in the national team and he is my mate so he will try to do his best and I will try to help my team-mates as well," Carvalho told setantasports.com.
"Yes, everyone knows how important Cristiano is for Manchester United.
"We have to be strong with him and we have to help each other to stop him."