The German international only joined the club a year ago from Schalke, but has found first team opportunities limited – especially under new boss Tim Sherwood – and has found himself linked with a return to the Bundesliga.
Borussia Dortmund have reportedly contacted Tottenham about the possibility of a transfer, but Fulham may offer Holtby the chance to stay in London with a loan move until the end of the season.
“My feeling is he will leave but it’s not in our hands at the moment,” agent Marcus Noack explained.
“Tottenham have to agree to let him go first. We hope to find a solution in the next couple of days.”
Holtby joined Tottenham for a cut price fee of £1.25million last January, as his contract with Schalke was set to expire in the summer.
Spurs are looking to make around £8-10million this time, but Noack believes a permanent transfer is unlikely this month.
Schalke are interested in re-signing the 23-year-old, possibly as a replacement for Julian Draxler, who is a target for Arsenal.
Fulham is perhaps the most realistic option, especially if Tottenham step up their interest in Cottagers striker Dimitar Berbatov before Friday’s deadline.