Watford manager Claudio Ranieri hopes his returning defenders will dramatically help his team.
The Hornets went down 1-0 to Southampton at home on Saturday, with three central defenders unavailable for selection.
"Now it is difficult for me to say something," said Ranieri.
"I can play just with the two defenders. Nkoulou is not ready yet, maybe he will be for the next match. The other two players, Francisco Sierralta and Christian Kabasele, have to come back and I want to see tham and maybe they can improve.
"I'm sure with the training sessions with these players we can improve."
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