Ryder Cup rookie Pieters out of Dutch Open

Defending champion Thomas Pieters has withdrawn from the Dutch Open due to a bee sting reaction.

Defending champ Thomas Pieters has withdrawn from the Dutch Open due to a bee sting reaction. (AAP)

Ryder Cup wildcard Thomas Pieters pulled out of the Dutch Open on Thursday after suffering an allergic reaction to a bee sting.

Defending champion Pieters, 24, was stung during a challenge round earlier in the week.

Pieters, one of the longest hitters in the game, will make his Ryder Cup debut for Europe against the US at Hazeltine, Minnesota at the end of the month.

He is one of six rookies in the 12-man European team who will be defending the title.