Manchester United have made an enquiry for Feyenoord right back Daryl Janmaat. The Holland defender has been attracting interest from Napoli, Spurs, Arsenal and Leicester. The 24-year-old has one year left on his contract but has already told the club he is leaving this summer, with team-mates Stefan de Vrij and Bruno Martins Indi also expected to depart. All have been followed by United scouts prior to Louis van Gaal’s arrival as manager and have been regulars in his World Cup starting line-up. United have an interest in Arsenal defender Thomas Vermaelen but are reluctant to match the valuation of £12m.