Manchester City boss Roberto Mancini concedes Manchester United have the best strike force.
United welcomed Robin van Persie from Arsenal yesterday.
Mancini said: "For this reason they are title favourites. That's the best in the world. For this reason we need to work more. Without Van Persie they are two yards in front. With him, they are five."For all the latest football news go to tribalfootball.com.