The Red Devils' boss believes the interchangeable nature of the Englishman and Netherlands international is crucial to their success after a fine goalscoring start to the season.
The duo scored a combined 57 goals last year, and Ferguson feels that playing them together will not diminish their production in front of goal as they are able to rotate between creator and finisher throughout a game. Although Rooney has often dropped into midfield during recent games, the Ferguson has publicly stated that goal difference will not be problem this season, revealing the secret to the duo’s success.
"There's flexibility there and the right type of movement,” Ferguson told reporters. “They also both have the courage to play in these positions. Robin's not far away in that respect. "They're both mobile players and good footballers with a great desire to play and win. I don't think you saw the best of them as a partnership against Arsenal."
Van Persie himself also noted after the victory over Arsenal that although both players play the same position, their understanding suits both players and therefore it works for the team as a unit.
"You have two positions, the nine and the 10, and we are both nine and a half," he told Sky Sports. "We are just helping each other out. We both play behind and a bit higher up. It seems to be working well and I am very happy with Wayne - hopefully we can keep it going."