Forster is not expected to come back into Southampton's team until midway through next season, after picking up a severe knee injury, and it appears that the club are already making plans to bring in a goalkeeper in the upcoming transfer window.
The Saints may feel that they need to bring in cover for Forster and they could look to Stekelenburg or Federici to solve their problem.
Stekelenburg should be made available by Fulham, with the London club known to be looking to offload him, while Federici may be obtainable should Southampton offer the right price.
If either of the pair came in they would likely be first choice until Forster came back to fitness, when the former Celtic man would be expected to replace them as the club's number one.
At the moment Southampton have the ageing Kelvin Davis and the inexperienced Paulo Gazzaniga in reserve, but Ronald Koeman does not appear to trust either as first-team regulars.
Davis has been placed in goal for the rest of the campaign, but his performances so far have done little to convince Koeman that he won't need to sign a 'keeper in the summer.