Gianfranco Zola says his players will be "buzzing" when they run out in front of at least 2,200 Watford fans at Birmingham on Saturday.
The club have sold out of their advanced allocation off 2,200 ahead of the clash at St Andrew's and another 300 away supporters are also able to 'pay-on-the-day' at the turnstiles.
"When the players find out how many supporters are coming they’ll be buzzing," Zola said.
"The supporters have been fantastic since the beginning of the season. We’ve been growing - as the team have been getting better and better, the crowd has become bigger and bigger.
"It’s a good trend and we appreciate that. When the away end has such a big following it really helps you a lot. I have been a footballer and I know how important supporters are for you."
Birmingham are 16th in the Championship table but are unbeaten in five in the league and have won their last two games at home.
Watford, currently fourth, came unstuck against lowly-placed Bristol City last month and Zola insists his team will not assume anything from the two sides’ league positions.
The Italian said: "To be honest, I don’t trust league positions because I’ve already burned my fingers in a situation like that.
"The nature of the Championship means I know that whilst they are in that position, we will certainly be facing a very good team so we need a great performance."
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