Maarten Stekelenburg's agent claims Fulham are one of several clubs interested in signing the goalkeeper from Roma.
The Netherlands international, 30, is out of favour with the Italian side and is thought to be available for a cut-price fee of around 4.7 million euros.
Stekelenburg played under Martin Jol at Ajax and the Fulham manager is confident of completing a deal after allowing reserve goalkeeper David Stockdale to join Hull.
But Stekelenburg's agent Rob Jansen has claimed there are other clubs interested in signing the shot-stopper.
"We are working on some things," Jansen told Goal.com.
"It's true Martin Jol knows him well but there are more situations which we are dealing with at the moment.
"There are more options that could be a possibility but we are moving step by step. It could be by the end of January and otherwise we will pick it up later on."
Stekelenburg has spent most of the season on the bench at Roma after losing his place to Uruguyan Mauro Goicoechea.
And Jansen confirmed his client's lack of action means he is growing frustrated with Roma coach Zdenak Zeman.
"It's a serious problem of course between him and the coach," he said.
"We are dealing with the situation with Roma in a very transparent and correct way. He's not made any final decision about leaving or whether he will stay there.
"We are looking at the market and if we have to act then we know what to do. The Premier League is one of the best competitions in the world so for every player wants to experience that."