Recently, the Swedish Football Association announced that Ken Sema has been forced to rebid for the upcoming gathering where Sweden will face Georgia and Spain.
The replacement will be Kerim Mrabti, everyday in KV Mechelen.
Watford reports via Twitter that these are knee problems for Sema.
The Swede is said to have sustained an injury to a ligament and will be gone for a few weeks.
The 28-year-old has played six games for the English club this season.