Kaboul continues to recover from a hamstring problem and is not expected back until after the international break so will miss the clash with Swansea.
Sebastian Prodl, who agreed a new four-year contract earlier this week, is improving although the Austria defender remains in the treatment room despite progress on a thigh injury.
Centre-half Miguel Britos is serving out a three-game suspension for his red card against Brighton, but right-back Kiko Femenia should be available after missing the Manchester City defeat as a precaution because of a head injury.
Watford head to Swansea on Saturday looking for an instant response from their home mauling by Manchester City and without a goal in three matches.
Boss Marco Silva said: "This (defeat) is a good match for us to learn something (from). Now is the moment to react.
"We did some things in the wrong way, which we need to improve.
"It was a bad afternoon, but it was in the past and we must look forward."