Anderson (left) and Nani look to be on their way to Old Trafford

The club have agreed "in principle" deals to sign Nani, 20, from Sporting Lisbon and Brazilian midfielder Anderson, 19, from FC Porto.

Nani now needs international clearance before the move to the Premiership champions is signed and sealed.

Owen Hargreaves will also join United on 1 July from Bayern Munich for £17m.

I could not imagine I would ever get to work with a manager like Sir Alex Ferguson but it has happened. What can I say? It is a dream the size of the world Brazilian midfielder Anderson

Anderson has described the proposed move to Old Trafford as "a dream come true".

He said: "I cannot wait to play in the same team as Cristiano Ronaldo, who is a great player, as well as Wayne Rooney and many more.

"I could not imagine I would ever get to work with a manager like Sir Alex Ferguson but it has happened. What can I say? It is a dream the size of the world."

Anderson has been named in Brazil coach Dunga's squad for the Copa America in Venezuela next month but was not in the squad to face England at the new Wembley on 1 July.

The teenager, whose full name is Anderson Luis de Abreu Oliveira, had his last season at Porto disrupted by a broken leg, but he started nine matches for Porto this season, scoring twice, and came on as a substitute six times.

He joined Porto from Gremio in December 2005 and played against United in a pre-season friendly last August at the Amsterdam Tournament.

Nani had also been linked with a move to Tottenham, but recently said he would only leave Portugal to play for a club like United.

606: DEBATE This is absolutely brilliant news for United MU

Nani, whose full name is Luis Carlos Almeida da Cunha, was born in the Cape Verde islands and has been compared to his compatriot Cristiano Ronaldo, with pace and trickery similar to that of the Footballer of the Year.

He has played five times for Portugal, scoring once in the process. This season he featured 29 times for Sporting Lisbon, scoring five goals and he will be viewed as the long-term successor to Ryan Giggs.