4) Dani Alves – Barcelona
The 31-year-old has arguably been the most effective attacking fullback of his generation, but is apparently surplus to requirements at the Nou Camp, with Liverpool linked with a £5m bid. He’s 31-years-old, but while he’s defensively shaky (occasionally), he’d fit perfectly into van Gaal’s wing-back formation – because he’d be allowed and encouraged to get forward as much as possible.