"In Lucas Torreira, we have signed a young player who is a very bright talent in the game", boss Emery added.
Torreira - the length of whose contract Arsenal did not reveal - performed well at the World Cup, playing in all their games and impressed national coach Oscar Tabarez enough to gain a place in the starting line-up in the 2-0 quarter-final defeat by France last Friday.
Torreira becomes Arsenal fourth signing of the summer.
Unai Emery has been in the market for a holding midfielder this summer after identifying it as an area that needed strengthening and Torreira emerged as a prime target with widespread speculation claiming Arsenal agreed a deal with Sampdoria shortly before the player flew out to Russian Federation last month.
Arsenal have already signed experienced Switzerland captain Stephan Lichtsteiner in a free transfer from Serie A giants Juventus earlier this summer to improve their options at full-back. "Welcome to Arsenal", the North London club tweeted.
France say Thierry Henry in ‘wrong camp’ for World Cup semi For France , Kylian Mbappe can score in a blink and already introduced himself this tournament as one of the world's top scorers. France midfielder Blaise Matuidi is available for selection after missing the victory against Uruguay because of suspension.
Clooney is in Sardinia to film a miniseries based on Joseph Heller's book " Catch 22 ", the news agency said. George Clooney is interviewed at the premiere for "Suburbicon" in Los Angeles, California last October.
Charlotte wore a pretty sleeveless floral sundress in pink, and she wore the same shoes as George , but in a cute pastel pink. The 92-year-old monarch has a busy week ahead, marked by a visit from US President Donald Trump in Windsor on Friday.
A GoFundMe page was set up on Saturday to help with funeral arrangements and any expenses Mary Rose may need once she recovers. Pictured Mary Rose Trinidad (second from the left) with her husband, Audi Marquez Trinidad and the couple's four children.
Johnson's resignation marks a major blow to the stability of May's government, with speculation it could collapse already rife . Shortly after Hunt left Downing Street, attorney general Jeremy Wright was seen entering the building.
In the months between Harry and Meghan's official engagement announcement and the royal wedding itself, it was her go-to style. The Archbishop of Canterbury, Justin Welby, who officiated their royal wedding on May 19, also presided over the christening.
Some of the patients said to be in a critical condition, according to Best Care ambulance services' Xander Loubser. The Civil Aviation Authority says it has dispatched its investigators to the plane crash site.
According to reports , Queen Elizabeth II then asked her personal dresser Angela Kelly for a replica of the gown to be made. Louis is set to wear the same christening gown used by his siblings, Prince George and Princess Charlotte .
English fans celebrated well into the night given that it is the country's first real shot at the trophy in many decades. Technically no team plays a more devastating counter attack than Roberto Martniez's side as Japan found out.
The 31-year-old forward played in 61 regular season games, averaging 7.5 points and at least one steal a game. Mbah a Moute spent the 2015-16 and 2016-17 seasons with the Clippers before joining the Rockets last season.
David Davis quits as Brexit Secretary
Sky Sources confirmed that Johnson repeatedly used the phrase at the away day at Chequers, the prime minister's country retreat. And asked whether Mrs May would fight a no-confidence vote if one was called, a senior Number 10 source said simply: "Yes".
Chelsea set to benefit from Ronaldo's deal to Juventus
Higuain arguably recorded his best personal season at Napoli that year as he netted 36 goals in just 35 Serie A games. At the moment we haven't spoken to any other clubs, as we have a three-year contract with Juventus .
Netflix makes it easier to manage downloaded shows on Android
Smart Downloads will notify you when the feature starts downloading an episode, and you can even turn it off if you aren't a fan. Netflix isn't yet ready to automatically predict and download shows or movies that you might want to watch, reports Quartz .
Dominic Raab is the new Brexit secretary
The Sun, Britain's biggest-selling newspaper, said there had been "blunder after blunder" by May. He said many MPs saw Mr Johnson's resignation as a "selfish act".
Croatia vs. England - Football Match Preview
Victory would see them return to the same venue to face either France or Belgium in the final. But he is certainly well aware of the threat that Croatia pose in the centre of the field.
Flooding and landslides in Japan leave at least 85 dead
Many people in regions affected by the disaster told AFP that the rains were unlike anything they had seen before. Rescuers in Japan dig through mud and rubble, racing to find survivors after widespread floods and landslides.