Gianfranco Zola claims he is still considering whether to make changes for tomorrow night's game with Millwall.
One player who could miss out at Vicarage Road is centre back Fitz Hall, who has a hamstring problem which is being assessed.
On Saturday, Zola said he would "probably use more players" against Millwall but the Italian claimed he was still undecided when he spoke this afternoon.
Zola said: "We do not know whether we will make changes yet, it is under consideration. I do not think you can play three games in a row [a week] with all the same players. Some players will need to rest. But I do not know if we will do so tomorrow or Saturday [when Watford play Leeds United]."
"Having a bigger squad helps a lot at times like this as I can make changes and still have a good team," Zola added.
Zola confirmed captain John Eustace (back), Prince Buaben (hamstring), Nyron Nosworthy (hamstring) and Neuton (ankle) were all still out injured.
On the other injuries, Zola added: "Geoffrey Mujangi Bia is ok. His fitness is better but we are not sure if his fitness is good enough to feature tomorrow.
"Almen Abdi is fine, he has no problems. But Fitz Hall is doubtful for the game. He picked up a problem and we are assessing him. He felt a problem with his hamstring near the tendon and we are not 100 per cent sure what it is."
Millwall have a relatively fit squad, with Paul Robinson definitely out due to a groin injury and Karleigh Osborne the only other doubt with a calf problem. Alan Dunne is back from suspension.
The Lions are on a good run of form; they are unbeaten in seven and have scored eight goals on their way to winning the last two matches.
When asked if he was concerned by the form of Millwall, Zola replied: "I am not concerned but I am respectful of Millwall.
"They are a side you cannot underestimate and we won't because the Championship is difficult every week."