The Netherlands pair suffered minor injuries after a collision with an enthusiast of the extreme sport on Ipanema Beach
The pair were on a visit to Ipanema Beach when the accident happened, the Dutch Football Association [KNVB] told VI Orange. "But beyond that, there is nothing to worry about", the statement added.
Netherlands fans will be relieved to hear nothing serious befell Manchester United striker Van Persie, who has a reputation for picking up injuries and mentioned before his incident with a kitesurfer that he has been in regular pain while playing for over half a decade.
Van Persie became the top Dutch goalscorer of all-time during qualification for the tournament in Brazil and boasts 43 goals from his 84 caps. Feyenoord defender Janmaat is less experienced having bagged 16 caps to date.
Louis van Gaal's men's first match of the World Cup is against Spain - who they played in the final of the 2010 iteration - on June 13 in Salvador. Their other Group B opponents are Chile and Austalia.
The team trained behind closed doors with coach Van Gaal on Monday, using Brazilian club side Flamengo's facilities.