Janmaat, 24, signed with Feyenoord as a six-year-old but was released at the age of 18, and went on to turn out for ADO Den Haag and Heerenveen before returning to Feyenoord in 2012. Ever since that transfer, the right back has gone from strength to strength, and has now earned his place as Holland's starting right back ahead of the World Cup.
His superb displays for Feyenoord this season haven't gone unnoticed, and the defender has subsequently attracted interest from a number of sides around Europe - most notably Premier League rivals Arsenal, Manchester United and Tottenham.
Arsenal are in desperate need of a right back with Bacary Sagna poised to leave the club at the end of his contract, and reports suggested that Janmaat was seen as a potential replacement by manager Arsene Wenger. Meanwhile, the appointment of Holland boss Louis van Gaal led to rumours that Janmaat would follow him to Old Trafford, where the Red Devils have struggled to find a consistent successor to Gary Neville.
Tottenham were also rumoured to be in the race for his signature after some poor displays from Kyle Walker this season, but despite that interest, Janmaat is set to leave De Kuip this summer - for a move to Italy with Rafael Benitez's Napoli.
The Italian side saw Colombian right back Juan Camilo Zuniga suffer a serious injury which sidelined him for four months, whilst Christian Maggio offered up inconsistent displays, causing Benitez to look to the transfer market in order to find a solid right back - and that's where Janmaat comes in.
Speculation in Italy suggests that have agreed a deal with Feyenoord to sign the defender, but they will need to wait until his World Cup campaign is over to agree personal terms and conclude a medical. There may still be time for the Premier League trio to hijack the bid, but it looks all but done that Janmaat will be a Napoli player in the coming weeks.