Claudio Ranieri says it is a "bad moment" for Watford, who have held only one full training session in over two weeks.
The Hornets face West Ham on Tuesday (15:00 GMT) in their first game since a 2-1 defeat at Brentford on 10 December.
Ranieri said trying to arrange training recently has "not been easy".
"I have just today [Monday] had the first training session all together," he said.
"Fortunately today all my players arrived together and that is very, very important. I have just the injured players and it's a bad moment now.
"It's a bad moment because the players can't train properly and I hope nobody suffers some injuries because you know when they don't train and they arrive at the end [of the game] it is very difficult to play, but that's it."
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