England centre-back Rio Ferdinand feels Portuguese winger and his Manchester United team-mate Cristiano Ronaldo would be the key as the Red Devils take a trip to Rome for their Champions League quarter-final first-leg against AS Roma on Wednesday.
The Red Devils have gained 16 goals in Premiership from the 22-year-old wide man and Ronaldo has also made a number of goals for his team-mates.
With England striker Wayne Rooney woefully out of form, Louis Saha just fit from a hamstring injury and Henrik Larsson back to his Swedish club, Ronaldo is the key to United's treble aspirations along with experienced midfielders Paul Scholes and Ryan Giggs.
Veteran striker Ole Gunnar Solskjaer is also back from a knee injury and was back into the scoring sheet immediately after he came on as a substitute in 4-1 win over Blackburn Rovers in Premiership on Saturday.
A confident Ferdinand said: "Not only has Cristiano scored goals this season, he has added so much more to his game.
"When you look back at the winner he scored at Fulham earlier this season it was like Roy of the Rovers stuff.
"It just showed his will to win, the character and the physical attributes he possesses."
Ferdinand, who believes Ronaldo is the Europe's number one player at present, added: "No-one has produced the kind of football he has produced on a regular basis and there is no other player as exciting as him.
"Ronaldinho hasn't done it and Samuel Eto'o has been injured a lot.
"Didier Drogba has been very good for Chelsea but I don't think he gets you off your seat like Cristiano does and I don't think as many people would pay to watch him."