Adam Masina and Imran Louza have become the latest Watford players to receive international call-ups, with both due to represent Morocco.
The pair will be able to play in next month's World Cup Qualifiers against Sudan and Guinea, with both games taking place in nations on the government's amber list.
Currently, no Premier League players are being permitted to play matches in nations on the UK red list, due to the continuing coronavirus situation.
Meanwhile, Daniel Bachmann, Joshua King and Craig Cathcart have all received call-ups and will also be permitted to play in their respective nations' matches, none of which are to be held in red-list countries.
Bachmann's Austria will face Moldova, Israel and Scotland during the break, while King's Norway will be playing against Netherlands, Latvia and Gibraltar.
Lithuania, Estonia and Switzerland await Cathcart's Northern Ireland.
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