Nemanja Vidic insists there is still plenty of improvement to come from Manchester United. The Red Devils continue their quest to reach a third successive Champions League final when they take on German title winners Wolfsburg at Old Trafford on Wednesday.
It will be the first meeting between the sides, who are expected to advance into the knockout stages after making victorious openings to Group B.
But Vidic knows his team can do far better than they managed in Istanbul two weeks ago, when a single Paul Scholes goal secured a precious away win against Besiktas.
"In results terms we are doing better than we have done for the previous three years so we should be happy with that," Vidic said.
"But we can always improve and I am certain we will get better.''
The presence of Vidic in central defence has been a constant for United at a time when the rest of their back four seems to be constantly changing.
A succession of injuries to usual partner Rio Ferdinand has hardly helped, although Vidic has now played with his regular stand-in Jonny Evans enough times to feel quite comfortable when the Northern Ireland star has to step in.
"Jonny has been with us for a year and a bit now and I have played a lot of games with him,'' Vidic said.
"He is a talented player and because we have trained together every day, I am used to playing with him.''
Vidic is also happy with the young player behind him in the United goal, Ben Foster, despite the 'keeper's error that led to a Manchester City goal in the Premier League derby.
With Edwin van der Sar ruled out for another three weeks as he recovers from the broken fingers he suffered in the pre-season defeat to Bayern Munich in July, Foster is set to play on Wednesday.
And Vidic has no qualms about that. "Everybody makes mistakes,'' he said. "It is normal. The player who never made a mistake didn't exist.'
"I feel comfortable with Ben in goal. The more games you have with a keeper, or a defender you play next to, you get used to them. You know how to play with them and what you are going to get from them. Ben is a good goalkeeper. I have plenty of confidence in him.''