Hoyle has funded the arrival of four new players during the transfer window and now wants supporters to help put some money back in the kitty.
"In January we've made investments that have improved the squad through the incomings of Nahki Wells, Joe Lolley, Harry Bunn and most recently Sondre Tronstad," Hoyle told the club's official website.
"All those don't come cheap, but it's sound football and business sense.
"I have no doubt, attracting talented players who are highly sought after is helped by the way we operate this club and the stability we have here. A lot of hard work goes into signings and we're all delighted to have the players here.
"We realise that the first team has six games during January and that this FA Cup game falls between expensive away trips to QPR - where the support was magnificent - and a very long trip to AFC Bournemouth on Tuesday evening."
Town have reduced ticket prices to £10 for adults for Saturday's tie against Charlton, who beat Oxford in their third-round replay.
"I now need supporters to really get behind Saturday's game and come to watch us in numbers," added Hoyle.
"Not only do we need a good attendance to make those (ticket) prices work for the club, but the vocal backing of the supporters can play a massive part in helping the side progress in a very important competition."