The former two joined the Hammers ahead of the current season while the latter was drafted in from Fenerbahce for the remainder of the campaign during the winter window.
All three have featured for Slaven Bilic as the Croatian looks to maintain a late push for a top four finish and reach Wembley in the FA Cup, but reports claim that despite there being options in place to keep all of them the Londoners are ready to let them go.
Song is, arguably, the biggest name on the list, and it was seen as quite a coup when the Irons kept him for a second successive season last year.
However, the Cameroonian, who is owed by Barcelona, has not made quite the same impact he registered in his debut campaign at Upton Park.
Moses is currently on loan from Chelsea, and looks set to be shipped back to west London.
The Nigeria international has spent successive seasons with Liverpool and Stoke, failing to make a lasting impact with either
His compatriot, Emenike, has netted twice in nine games – both against Blackburn in the FA Cup – and is not seen as a vital player going forward.