Tony Capaldi's proposed move to Crystal Palace has broken down, forcing the Eagles to look elsewhere.
The Northern Irish full-back looked all set to agree terms last week, but the deal has collapsed at the final hurdle.
Eagles boss George Burley has been left frustrated, having come so close to landing Capaldi on a free transfer, but admits that he remains in the market for a full-back.
"As is always the case with these things, it's never done until it's done and it looks like we will now be looking for another left-back to fill that hole," he told sportcroydon.co.uk.
Meanwhile, despite missing out on Capaldi, Palace are close to finalising a deal for Ipswich midfielder Owen Garvan.
The Irishman is set to undergo a medical at Selhurst Park on Monday and Burley is delighted to have almost secured one of his top targets.
"To attract players of Owen's calibre shows the club has real ambition," he said.
"Everything is agreed and he just needs to pass his medical."
There had been some confusion as to whether Palace could buy players while still officially under administration, but Burley is confident an agreement will be pushed through.
He added: "Well there is a fee agreed and I've been told that everything is okay, so I hope there is no problem."
Burley is also looking to add two further fresh faces to his squad before the start of the season, but has refused to confirm whether Wolves striker Sam Vokes and Leicester midfielder Matt Oakley are on his shopping list.
"There will be speculation," he said.
"We are still hoping to add a striker and another midfielder this week."