Paris St Germain have signed Uruguay international Manuel Ugarte from Sporting Lisbon for €60 million, with the defensive midfielder signing a five-year contract.A prodigy who made his first-team debut for hometown club CA Fenix at the age of 15, Ugarte moved to Portugal to play for Famalicao before being snapped up by Sporting.The 22-year-old was called up for the World Cup in Qatar last year and has eight caps for Uruguay."I'm really happy to take this big step in my career at such a great club," Ugarte said in a statement. "I'm going to give my all for Paris Saint-Germain."Ugarte is PSG's third new recruit in the close season after they signed centre back Milan Skriniar and forward Marco Asensio on free transfers from Inter Milan and Real Madrid respectively.The club also sacked manager Christophe Galtier on Wednesday and replaced him with former Barcelona and Spain coach Luis Enrique.William Saliba has become the latest big-name Arsenal star to commit his future to the club after signing a new long-term contract.The France defender played a pivotal role as the Gunners ultimately came up short in their Premier League title tilt last season and has now agreed fresh terms at the Emirates Stadium.Saliba, 22, was an ever-present in the league until he suffered a back injury during the Europa League defeat to Sporting in mid-March - an issue that would ultimately rule him out for the remainder of the campaign.Without him, Mikel Arteta's side saw their lead at the top of the table cut by Manchester City, who eventually powered past Arsenal to retain their title.Now, though, an agreement has finally been reached that ties Saliba to the club on a four-year deal."I was born in north Paris, but became a man in north London,"