Manchester United chief executive David Gill insists the club have funds to challenge for the title next season.
Sir Alex Ferguson is keen to strengthen his side after missing out on the Premier League crown to Manchester City.
Ferguson has been linked with Borussia Dortmund duo Shinji Kagawa and Robert Lewandowski.
But he says he will spend wisely after claiming City pay stupid money and silly salaries .
Ferguson also has Eden Hazard on his radar after watching the Lille midfielder on several occasions although City are also ready to move for the 30 million pounds-rated talent.
A 23-year-old playmaker whose 13 goals in 29 games helped Borussia Dortmund win the Bundesliga title. Kagawa was a bargain when he joined from J-League side Cerezo Osaka for just 35,000 euros in 2010.
We know City are going to spend fortunes, pay stupid money and silly salaries, said the United manager.
We know that happens. We can t do anything about that.
We are not like other clubs who can spend fortunes on proven goods. We invest in players who will be with the club for a long time, who will create the character of the club and the excitement for our fans.
We are good at that and we are going to continue that way.
Meanwhile, City chairman Khaldoon al-Mubarak has hinted the Blues may not spend as much as they have in recent close seasons.
As well as Hazard, manager Roberto Mancini has been linked with a move for Arsenal striker Robin van Persie.
We have a championship-winning team, Khaldoon told City s official website.
We are not starting from the same point as in other pre-seasons.
We have had to improve in a very dramatic manner. Now we have a nucleus. To improve further we have to harness that nucleus.