By Jonathon Moore

With David Beckham's move to Real Madrid resolved, Manchester United boss Sir Alex Ferguson will now turn his attentions to bringing new blood into Old Trafford.

The United boss has made little attempt to hide his admiration for Brazilian ace Ronaldinho, but Beckham's replacement could come from closer to home.

BBC Sport takes at look at five players rumoured to be on the Old Trafford 'wanted list'.

Position: Striker Club: Paris Saint-German Age: 23 Estimated value: �10m

The Brazilian made such an impact in his youth that Paris Saint-German broke the world record transfer fee for a teenager to bring him to the club.

An international regular, 'Little Ronaldo' cemented his reputation as one of the world's most dangerous players during Brazil's victorious 2002 World Cup campaign.

After returning late from the winter break, he has since fallen out with his club and looks certain to move on this summer.

Ferguson could have a huge fight on his hands persuading him to move to United with Real, Barcelona, AC Milan and Inter all chasing his signature.

Position: Midfielder/Forward Club: Leeds Age: 24 Estimated value: �6m

With 16 goals last season, Harry Kewell is admired throughout the Premiership as one of the league's most potent players.

After making his name as Lee Sharpe's deputy, Kewell has become an Elland Road favourite, though the club are unlikely to cling on to his services.

Despite being offered a reported �2.5m-a-year deal to stay, the 24-year-old has his sights on a move away, with Arsenal the current favourites to land the Aussie star.

Position: Forward Club: Barcelona Age: 26 Estimated value: �10m

David Beckham's decision to shun Barcelona will have done little for United's chances of attracting Kluivert, should they choose to pursue him.

As a player, he made his name at Ajax, scoring 39 league goals in 70 games.

An unsuccessful spell at AC Milan followed, before Barca recruited him for �8.2m.

He has since notched up his 100th goal for the club and equalled compatriot Dennis Bergkamp's record of 37 goals for Holland.

Kluivert's strength and skill with both feet make him a target for the world's top clubs.

But, after publicly committing himself to Barca, he seems unlikely to readily agree to a move away.

Position: Midfielder Club: Blackburn Age: 24 Estimated value: �15m

The Ireland star enjoyed a superb World Cup and his regular man-of-the-match performances for Blackburn make him an ideal target for Old Trafford's money men.

Liverpool have reportedly offered �12.5m for Duff's services, but Blackburn boss Graeme Souness is holding out for a higher offer, so certain is he of his midfielder's talents.

Already linked with Old Trafford, Manchester United chief executive, Peter Kenyon, told BBC Sport in April: "If Sir Alex wants to buy someone, he will have to sell someone else."

With those conditions now met, United are in the enviable position to outbid anyone should they consider Duff worthy of the price tag.

Position: Goakeeper Club: Leeds Age: 23 Estimated value: �3m

After initially impressing under former Leeds boss David O'Leary, Robinson has displaced first choice goalkeeper Nigel Martyn.

He has been tipped to take over from David Seaman as England's next long-term goalkeeper.

The former England U21 star insists he will stay at the Yorkshire club if he is offered an extension to his contract but he has yet to discuss his future with chairman Professor John McKenzie.

"In March I went to see the club chairman Peter Ridsdale," he said recently. "He assured me that the club had no intention of selling me. He was quite categoric. I would not be sold."