Feyenoord defender Rick Karsdorp is being watched by Europe's biggest clubs.

Calciomercato.com says Arsenal and Manchester United are monitoring the right-back as they look to bolster their defensive options.

It's suggested Inter Milan, Bayern Munich and Monaco are also potential suitors.

Despite his relative youth, the 21-year-old has already racked up 59 appearances for the Rotterdam-based outfit.

He's highly rated in the Eredivisie and has also been capped twice for Holland.