Ipswich Town have failed with offers for three players, understood to be Crewe's Nick Powell and Portsmouth pair Jason Pearce and Joel Ward.
Boss Paul Jewell is hopeful chief executive Simon Clegg can still engineer deals for the trio.
"The bids have been rejected. It's up to the chief executive to try and come to a deal if a deal can be done," he told BBC Radio Suffolk.
"If it can't be done we move on and we go elsewhere."
Striker Powell, 17, won December's Football League player of the month award and has scored six goals in 24 games this season.
Defensive duo Pearce, 24, and 22-year-old Ward have featured 49 times between them this term and .
Pearce was a summer signing from south coast neighbours Bournemouth while Ward is a Fratton Park academy product.
Jewell's desire for a defender will have been fortified by the confusion surrounding his approach for Leicester centre-half Sean St Ledger.
The Irishman looked like he was out of favour at the King Power Stadium and had agreed terms with Town.
But he started Tuesday's 4-0 FA Cup replay win over Nottingham Forest - his first game for a month - and Jewell fears the signing may no longer happen.
"It's a bit of a strange one that because the deal was agreed but for some reason it changed last minute," he said.
"That's probably out of our hands."