Ryan Giggs and Nemanja Vidic are confident Manchester United can retained the Premier League title next season even if the side don't make any signings between now and deadline day in the summer transfer window.

United have so far pursued two of Barcelona's finest midfielders in the summer transfer window, and failed to land either Cesc Fabregas or Thiago Alcantara with the former committing to his current club and the latter moving to Bayern Munich.

The current title holders will have to compete alongside newly invigorated Manchester City and Chelsea squads next season, with their rivals signing four and three first team players respectively so far.

United's defensive problems were well documented last season and with Wayne Rooney facing an uncertain future on the back of a tough season with the club it would seem that a big-name signing would give fans a great deal more faith in incoming manager David Moyes continuing the success of Sir Alex Ferguson.

But Giggs, who is working with the club both as a coach and player next season, insists that United don't necessarily need to bring in new faces to compete with the best in the upcoming campaign.

"Obviously, Mourinho has come in to Chelsea, and City are spending quite a bit of money, but it is not something we are worried about," Giggs told the Daily Mirror.

"The quality is in the squad. We showed that last year. Now we have to show it again. We won the league with those players so we are looking forward to the start of the season.

"If we sign someone - great. If not, we will just get on with it."

Vidic holds similar opinions to his teammate, arguing that it's important to concentrate on the goals ahead and not let media speculation put doubts in their minds.

"We respect everyone's opinion, but we know the players we have here," he explained. "We know what the expectations are. We are just focused on winning the title and we are not very bothered about what people say.

"We will show we can compete for the big trophies again, Champions League and Premier League. We don't have a problem with that.

"We never fight for our place in the media, we like to fight on the pitch and we'll do that again. Every season you have to prove you are good enough to play for this club."

United will be well aware of just how dangerous it can be to stand still in the summer transfer window on the back of winning a title; former City manager Roberto Mancini attributed his side doing so in 2012 attributed to Sir Alex Ferguson being able to take the trophy back from his rivals in the season following.

Moyes insists that the club are working hard to land their targets before deadline day, but with the season starting this weekend the pressure will be on to get off to a good start with the current squad.