The twenty five - yr - previous has joined on a lengthy - time period deal for a price undisclosed by the club, but Sky Athletics understands the determine to be in the area of 35million.
Sanchez, who starred as Chile attained the final - sixteen of the Planet Cup, explained : " I am so satisfied to be becoming a member of Arsenal - a club with a good supervisor, a great squad of players, large assist about the world and a excellent stadium in London."
Considered one particular of the most interesting attacking gamers in earth soccer, Sanchez made more than a hundred appearances in all competitions for Barcelona following a 2011 move from Udinese, scoring forty three ambitions in 3 seasons with the Catalonians.
But irrespective of his contribution to their 2013 La Liga and 2012 Copa del Rey triumphs, among a variety of other domestic trophies, Barcelona believed he was no more time required at Camp Nou over and above this summer time.
Sanchez was courted by a range of clubs across Europe, with Juventus and Liverpool exhibiting the strongest curiosity along with Arsenal, but the player created his desire to transfer to north London clear to his associates.
Sky sources figured out he had arrived at Arsenal's London Colney teaching intricate to undertake a health-related on Thursday and on completing the offer, manager Arsene Wenger stated : "Alexis will add electrical power, creative imagination and considerably excellent to our squad.
"He has regularly made best - good quality performances at the best degree and we are all enthusiastic to see him integrate into the Arsenal squad."
Barcelona, meanwhile, said : "We thank Alexis Sanchez for his professionalism and determination and desire him all the ideal for the future."
Sanchez started his vocation at Chilean side Cobreloa before transferring to Colo-Colo, just one of the biggest golf equipment in his house nation, in which he twice received the Primera championship in 2006 and 2007.
His prowess acquired him a shift to Argentine giants River Plate, exactly where he gained the league in his initially and only season, ahead of going to Italy with Udinese in 2008 where he scored twenty moments in 95 appearances.
Sanchez created his worldwide debut in 2006 and has gone on to rating 24 ambitions in 71 caps. He was integral to their achievement in Brazil this year, scoring two times and delivering an guide as Chile reached the previous - sixteen for only the fourth time in their history.
The player will now get depart for vacation prior to joining up with his new meamates afterwards in July, and the club be expecting Sanchez to make his initially Arsenal appearance at the Emirates Cup on the weekend of August 2.
Sanchez is Arsenal's first signing of the summer time but they are also comprehended to be close to the signing of France correct -backMathieu Debuchy fromNewcastle.