Watford head of academy Chris McGuane is appealing to Hornets fans not travelling to the Etihad on Saturday to support the Under-18s as they try to knock holders Norwich City out of the FA Youth Cup.
The young Hornets kick off at 1pm at Vicarage Road, two hours before Watford take on Manchester City in the senior competition, and tickets are £3 for adults and £1 for concession into the Upper Rous Stand.
"We're very respectful of the fact there are going to be over 3,000 of our fans at Man City with the first-team," McGuane told the club website.
"But because there was a first-team game due to be at Vicarage Road on Saturday originally we're hoping that plenty of Watford fans will see fit to turn out and get behind the lads."
He continued: "I know [youth team coach] Dave Hughes and the lads have a tremendous spirit around the squad and a powerful sense of self-belief.
"If we can harness that really well, and have a good few hundred fans behind us at Vicarage Road, then I know we can give Norwich a real test."
Tickets for the Under-18s FA Youth Cup match can be purchased in advance while fans can also pay on the day with cash at the north-west turnstiles or card payments at The Hornets Shop.
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