Watford manager Malky Mackay could give debuts to new signings Rene Gilmartin and Tom Aldred.
Defender Dale Bennett remains a doubt as he battles to regain fitness from a pre-season injury.
MATCH FACTS
Head-to-head
• This is the first meeting of these clubs since Aldershot reformed in 1992.
• The clubs have never previously met in the League Cup.
Have your say on the game
Aldershot
• Aldershot have lost their last four first-round ties in this competition.
• The club's most recent victory in the League Cup was 6-2 at home to Peterborough in the first round, second leg in August 1989.
• This is Kevin Dillon's first cup match in charge of Aldershot.
Watford
• The 1979 semi-finalists have not lost in the opening round since 2002.
• The Hornets needed extra time to see off Barnet in the first round last season. They then went out in round two to Leeds, after extra time.
Source: BBC Sport
Source: BBC Sport