As Sir Alex Ferguson unveiled his first two signings of the summer, Shinji Kagawa and Nick Powell, the Manchester United boss revealed that there could be two more on the way before the window slams shut at the end of August.

While the deals for Kagawa and Powell were wrapped up soon after the season's climax, Ferguson has said that Euro 2012 has delayed the club from making future additions.

We could possibly bring one or two more in, said Ferguson. When there's a major international tournament on there's a delay in the transfer market. But now the European Championships are over we're trying to bring someone in.

Despite Ferguson's best efforts, it appears that Luka Modric won't be one of the players arriving at Old Trafford. United reportedly made signing the Croatian playmaker a priority this summer, but Tottenham are resolute in their desire that the player only be sold to a club outside of the Premier League.

That would rule out United and leave the coast clear for Real Madrid and Paris Saint-Germain. The mega-rich Ligue 1 side have reportedly bid €40 million for Modric with coach Carlo Ancelotti also praising the player's qualities.

It is Real Madrid who are very much the front-runners, however. Marca reports that Real have all but agreed terms with Modric and are now playing a waiting game in order to try and force Tottenham to lower their asking price.

United may also be set to miss out on another of their chief-targets this summer. Porto's exciting 20-year-old winger James Rodriguez has claimed that he has no interest in a much-speculated move to Old Trafford this summer.

I want to stay at FC Porto, he told Jornal de Noticias. I'm at a big, big club, this is my Porto.

United could yet potentially swoop for Crystal Palace's highly-rated young right-back Nathaniel Clyne. The England Under-21 international has been linked to United, as well as several Premier League rivals, for some time.

With the player now out of contract at Selhurst Park, any club wishing to take the player would be forced to pay a compensation fee decided by a tribunal. Crystal Palace chairman Steve Parish has said that may be putting clubs off, although he is now eager to come to an agreement.

We need to do a deal with Clyne, he said, according to the Daily Mail.

There is a bit of action in the background and we know there is a lot of interest.

It is just about sorting out who it is best to go to and who will put the right money on the table. We're all working to get an outcome.

Clubs don't want to go down the tribunal route. It is a game of cat and mouse on the fee-we've just got to let that play out.

There could also be one or two players on the way out of Old Trafford this summer in order to ease the burden on United's wage bill. Chief among the potential exit candidates is Dimitar Berbatov. Despite Ferguson making it clear that the Bulgarian forward can leave, United's asking price of £10 million is deterring potential suitors, according to the Daily Mail.

 Malaga and Paris Saint-Germain remain interested, but the 31-year-old is scheduled to travel on United's pre-season tour of South Africa and China.