The back-to-back cup winners progressed to the final eight of the 2015/16 version of the competition with a 4-0 victory over Hull City to the KC Stadium on Tuesday night, but lost Per Mertesacker, Gabriel Paulista and Aaron Ramsey to injury.
Wenger is now looking to use the next four days, prior to Sunday's home meeting with the Hornets, to get his squad ready as they continue their pursuit of a third-straight cup.
"They are a good side and it will be a very interesting tie," he told BT Sport 1.
"We play at home on Sunday now so we have some days to prepare.
"Let's see if we can recover one or two injuries and keep playing the way we played today."