Louis van Gaal could use Nani as leverage in a move for Chile midfielder Arturo Vidal, while Arsenal are rumoured to be in for Lars Bender
Cardiff live updates
Crystal Palace have signed striker Fraizer Campbell from Cardiff.
Campbell has joined for an undisclosed fee, putting pen-to-paper on a three-year deal with the London club.
The 26-year-old, who came through the youth ranks at Manchester United at the start of his career, won the solitary senior England cap he has to his name in 2012.
Steven Caulker has completed his move from Championship side Cardiff City to newly promoted Queen's Park Rangers.
The 22-year-old centre-back has joined Harry Redknapp's side after just one season at Cardiff, who were relegated from the Premier League at the end of the 2013-14 season.
– Cardiff City's Gary Medel
I remain a player of Cardiff, but now doors are open to play elsewhere and I hope that happens. Nothing has been said yet but I am wanted in Italy and that is a good possibility.
Cardiff have signed Crystal Palace midfielder Kagisho Dikgacoi on a free transfer.
The 29-year-old South African international, formerly of Fulham, was out of contract at Selhurst Park and turned down a new contract before dropping down a division to sign for the Bluebirds on a three-year deal.
Cardiff have announced the signing of Federico Macheda on a three-year deal from July 1.
The former Italy Under-21 striker will join the Bluebirds, who finished bottom of the Premier League this season, when his contract with Manchester United expires this summer.