Swindon Town chairman Lee Power says the proposed signing of Jordan Stewart from Glentoran has become "messy".
Power revealed a fee, reported to be £50,000, was agreed at the weekend for the 20-year-old forward.
However, the player failed to turn up at the County Ground as expected.
"We wanted Jordan in the squad for Tuesday, there are agents involved and every Tom, Dick and Harry," Power told BBC Wiltshire. "To be honest with you, it got a bit messy."
Stewart joined Glentoran in 2013 and has scored 16 goals, including a hat-trick against Warrenpoint Town last season.
He has previously spent time on trial at Stoke City, Middlesbrough and Peterborough United, and signed a two-year contract extension with the Glens back in March.
"We expected him to be here at midday on Tuesday and he's not turned up," added Power. "I don't think it's the lad, I'm not sure about the communication between the agent and the club but it's not very professional."
Swindon are seeking extra attacking options, with Jermaine Hylton having been ruled out for two months with a fractured collarbone, Jon Obika struggling with a calf problem, Miles Storey out of favour and Josh Cooke on loan at Cheltenham Town.
And with uncertainty surrounding the future of Michael Smith, Power is actively looking to bolster their forward options.
"There has been interest in Smith from Barnsley and two other teams now as well," he said.
"We have a little bit of crisis and are down to one striker so we are trying to get another one in. We are looking at a short-term loan and if something does happen with 'Smithy', we need to bring a permanent one in. We won't leave the team without a striker.
"There are ongoing talks with various parties and we are working hard behind the scenes to bring some people in."