The Gunners are in-form having won their last six out of seven games since their 4-0 defeat to Liverpool in August.
And the Watford boss is aware of the challenge his side faces at Vicarage Road on Saturday.
"The last seven games they have won six and only drawn once, against Chelsea at Stamford Bridge, and they were really close to winning that game.
"They look like a more balanced team and with the ball they have a lot of quality. So, for us, it will be a tough game but that is what we expect against a good team."