Watford boss Javi Gracia is unsure if goalkeeper Egil Selvik will be fit to face Derby when the Hornets return to Championship action on Saturday (15:00 GMT).
The Norwegian international picked up a shoulder injury in their 1-1 draw with Bristol City earlier this month and had to withdraw from the Norway squad for their recent World Cup qualifiers.
"We will see how he is, he feels well but we are expecting some test results," Gracia told BBC Three Counties Radio.
"After being with his national team he felt something similar he did in the last game.