Pereira, 22, was part of Jose Mourinho's squad for the tour of the United States but has signed a season-long deal with the Portuguese side.
West Ham United's busy transfer window continued as the Premier League club signed Portuguese forward Xande Silva from Vitoria de Guimaraes.
Sporting Lisbon filed a complaint to FIFA and the Court of Arbitration for Sport against three of their players that terminated their contracts.
West Ham have sent a delegation to Portugal to tie up deals for Porto's Moussa Marega and Yacine Brahimi and Benfica teenage sensation Joao Felix.
Tosin Kehinde has left Manchester United to join CD Feirense.
Atletico Madrid have signed free agent Gelson Martins, formerly of Sporting Lisbon, on a six-year contract, the club have announced.
Defender Chancel Mbemba has joined Portuguese champions Porto from Newcastle United.
Fernandes was one of nine players who had their contracts with club legally terminated after armed hooligans attacked their training camp.
Mihajlovic replaced Jorge Jesus on a three-year contract by then-president Bruno de Carvalho, who was voted out of the club on Saturday.
Sporting have overwhelmingly voted to eject president Bruno de Carvalho in a bid to save the Portuguese club after nine players quit in protest.
A comprehensive list of all the champions, European qualifiers and relegated teams across the major leagues.
Mihajlovic takes over at a club in turmoil after nine players terminated their contracts after an incident in which fans attacked players and staff.
Premier League newcomers Wolverhampton Wanderers signed Portugal goalkeeper Rui Patricio from Sporting Lisbon.
Mexico forward Raul Jimenez will join newly promoted Wolverhampton Wanderers in the Premier League next season, on loan from Benfica.
Benfica forward Anderson Talisca has opted to join Chinese Super League club Guangzhou Evergrande on a six-month loan following links to Man United.
Patricio, 30, has written a 34-page document describing why he wants to leave Sporting, accusing Carvalho of turning fans against the team.
Roma have signed defender Ivan Marcano from Porto on a free transfer.
Iker Casillas is delighted to have signed a new one-year contract with FC Porto.
Veteran goalkeeper Iker Casillas has ended speculation about his future by signing a new one-year deal at Porto.
A group of fans forced their way into Sporting Lisbon's training center on Tuesday and assaulted its players and staff on Tuesday.
Everton are among a number of clubs interested in Porto manager Sergio Conceicao, sources close to the coach have told ESPN FC.
Porto goalkeeper Iker Casillas said it was wrong for former club Real Madrid not to give a guard of honour to La Liga champions Barcelona.
Iker Casillas hopes to sign a new contract to remain with FC Porto for another season.
FC Porto won their first Portuguese Liga title in five seasons after a draw by rivals Benfica and Sporting Lisbon left both out of contention.
Chelsea's under-19s are through to the final of the UEFA Youth League after a penalty shootout victory over Porto in Nyon.
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