Manchester United have announced the £16m signing of Argentina international defender Marcos Rojo on a five-year contract.

The 24-year-old joins from Sporting Lisbon, with
Nani moving to the Portuguese club on a season-
long loan.
"Playing for the world's biggest club is a dream
for me," said Rojo, who will wear the number five
shirt.
The left-sided defender played in six games as
Argentina reached this summer's World Cup final
in Brazil.
Tim Vickery - BBC Sport's South American
football expert
"I think what might attract Louis van Gaal is
the versatility that Rojo offers. He can both
push on and he can also cover very well. So
maybe Van Gaal is thinking this player is a
natural for the left-sided defensive position in
a back three. He can also play as an orthodox
left-back."
Rojo is United's third signing of the summer and
strengthens manager Louis van Gaal's defensive
options.
The Dutchman started with debutant Tyler
Blackett as part of his three-man defence in last
Saturday's 2-1 home defeat by Swansea City.
By the end of the game, winger Ashley Young was
being used in the left-back role following a
switch of formations.
"Marcos is a very gifted defender. He can play
either as a central defender or left-back," said
Van Gaal.
Rojo scores World Cup
winner for Argentina
Rojo could make his debut in Sunday's game at
Sunderland, with fellow summer signing Luke
Shaw out for another three weeks because of a
hamstring injury.
Sporting will receive £8m immediately, with
further instalments of £4m being paid on 1
December this year and 1 July, 2015.
In addition they will get 20% of any sell-on fee for
Rojo over £18.4m.
Rojo, who joined Sporting from Spartak Moscow
in July 2012, missed the Portuguese club's first
league game of the season last weekend.
United have been searching for defenders
following the summer departures of Nemanja
Vidic , Rio Ferdinand and Patrice Evra , with Rojo's
versatility making him a good fit for United
manager Louis van Gaal's preferred 3-5-2
system.
"He has ability, physical strength and a
willingness to learn," added Van Gaal. "That
means he has a very bright future ahead of him.
"He had a very strong World Cup and has been
playing in Europe for a couple of years now."