Eighth-placed Watford have just one win against Arsenal in eight Premier League meetings but will look to build on their decent start.
The Gunners are unbeaten since their loss to Liverpool at the end of August, but going into the game against the Hornets, they could be without two of their key defenders in Shkodran Mustafi and Laurent Koscielny.
Wenger said forward Danny Welbeck (groin) and midfielder Mesut Ozil (knee) had recovered from their injures and were training, while defender Sead Kolasinac had a minor hip problem.
Koscielny, on the other hand, skipped the recent worldwide break to recover from an Achilles injury that has been a long-standing issue for the France defender.
LONDON, ENGLAND - MAY 27: Per Mertesacker of Arsenal and Arsene Wenger, Manager of Arsenal speak prior to The Emirates FA Cup Final between Arsenal and Chelsea at Wembley Stadium on May 27, 2017 in London, England.
The Italian-owned side are seriously impressing this season, and will pose a tough task for our boys, despite our top form coming into the match. We will check him today.
"I will decide what I have to do when Koscielny has his test tomorrow".
The Gunners will keep a close eye on forward Alexis Sanchez as he has had a long trek back to London following Chile's final World Cup qualifier against Brazil, which saw them lose 3-0 in Sao Paulo and miss out on a place in Russian Federation next summer as a result.
Boy Scouts will admit girls in 2018
The Girl Scouts of the United States of America said the move strains the century-old bond between the two organizations. From a peak of over 5 million members in the 1970's there are now under two and a half million boys in scouting.