Gillingham boss Andy Hessenthaler was angered by Swindon's Jeremy Wray for publicly declaring their pursuit of Luke Rooney.
Wray came out in the local press in Wiltshire last week to reveal the Robins are actively pursuing the 21-year-old, who turned down the offer of a new contract at the Priestfield Stadium earlier this term.
Hessenthaler was frustrated by the timing, with the Robins interim chairman's revelations coming just hours before the two sides each took on Premier League opposition in the third round of the FA Cup on Saturday.
"I am not going to get into a war with Swindon but to actually come out and put it into the press the day before a big FA Cup tie, I am disappointed in their chairman and I know my chairman (Paul Scally) is livid as well," he told Kent Online.
"They have had a private conversation and to come out onto Radio Wiltshire and say that they had made a six-figure bid is not good conduct for me and the way that business should be done.
"We won't go into that any more but that's the way we feel about it."