Turkish keeper Bayindir was signed for just 4.3 million pounds ($5.41 million), while Spanish left back Reguilon and Morocco midfielder Amrabat's signings are loan deals.
Champions City, who have had a 100% start to the Premier League season and top the standings, added another midfielder to their squad with Nunes joining from Wolverhampton Wanderers.
Earlier on Friday, 21-year-old winger Cole Palmer moved from Manchester City to Chelsea in a deal reportedly worth 40 million pounds.
The transfer fee offered was reportedly 100 million pounds, with a further 50 million in add-ons.
($1 = 0.7946 pounds)Reporting by Aadi Nair in Bengaluru; Editing by Ken FerrisOur Standards: The Thomson Reuters Trust Principles.
Persons:
Matheus Nunes, Peter Cziborra, Jonny Evans, Sergio Reguilon, Sofyan Amrabat, Rasmus Hojlund, Mason Mount, Andre Onana, Bayindir, Evans, Nunes, Pep, Kevin De Bruyne, Fati, Tyrone Mings, Clement Lenglet, Cole Palmer, Mason Burstow, Mohamed Salah, Juergen Klopp, Salah, Joao Palhinha, Aadi Nair, Ken Ferris
Organizations:
Soccer Football, Premier League - Brighton & Hove Albion, Wolverhampton Wanderers, American Express, Manchester United, Altay Bayindir, Manchester City, United, Leicester City, Champions City, Premier League, Portugal, Barcelona, Brighton & Hove Albion, Aston Villa, Chelsea, Championship, Sunderland, Liverpool, Saudi Pro League, Al, Saudi, Bayern, Fulham, Thomson
Locations:
Brighton, Britain, United, Spanish, Reguilon, Morocco, Manchester, Ittihad, Egypt, Liverpool, Bayern Munich, Germany, Bengaluru