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have players to come back and this is a project that I'm going to improve as we go along. It's a massive challenge. I'd hoped I'd be in a far better position than this but we're not."
Forward pair Wayne Rooney and Robin Van Persie are likely to remain out of action for a few more weeks but David Moyes' sole expensive recruit Marouane Fellaini is due back soon and will have a cast removed from his wrist on Monday.
While David Moyes, who replaced Alex Ferguson in the close season, was supported by England midfielder Michael Carrick in refusing to rule out their slim title chances, Vidic did not believe Manchester United F.C. could overhaul the leaders.
"Yes, I think so now we are too far behind," the Serbian told Sky Sports.
"We have to focus now to get in the top three, top four. We have to be positive. It's not going to be easy but we have to now fight for different things.
"We have to focus on the (Capital One) Cup and the Champions League.
"It's never easy but we have to stay positive, we have to stick together, we have to work hard to change the things around.
"Hopefully we can play better football and with a bit of luck I think we can achieve that."