Frank Maloney has called for Rendall Munroe fans to create an intimidating atmosphere for Victor Terrazas.
Munroe meets the dangerous Mexican in a WBC super-bantamweight title final eliminator at Coventry Skydome on April 23 in the toughest test of the Leicester binman's 21 fight career.
Promoter Maloney said: "Rendall has been fighting in the first division of British boxing and it's time to step him up to the Premiership. Leicester City are on the brink of the Premier League and Rendall is as close to world title glory.
"The venue holds just over 3200 fans and so far we have sold two thirds of the tickets. We need this to be a sell-out to show that Rendall has reached the big time and can be classed alongside the biggest names in Britain.
"A packed crowd will intimidate the Mexican and act like an extra fist in the ring on what is the biggest test of his career so far."
Southpaw Munroe's manager Mike Shinfield also believes that the fans will make a huge impact on the night. He said: "He's never fought outside of Mexico and like all football managers say, we need the crowd to be the extra man.
"When things are getting tough the crowd can help you though it. When Rendall has 3000 of his mates cheering him on, he will always dig that little bit deeper."
The show also features a bumper undercard including Olympic Bronze medallist Tony Jeffries and a host of local talent.
Tickets are on sale, prices £30, £50 and £70 by logging onto www.frankmaloney.com or by calling 0871 226 1508. Boxers on the bill are also selling tickets.