Sakho handed in a transfer request earlier this month, following Slaven Bilic's claims that he wantd to sign a "top" striker.
The 26-year-old appears to be on Sunderland's radar who had an £11m bid rejected for the forward.
The Senegal international has made 50 appearances for West Ham in two seasons, scoring 19 goals for the Hammers.
Where next for Diafra Sakho?