Schalke coach Roberto di Matteo is being linked with a return to London.
The former Chelsea manager took charge of Schalke only earlier this year and enjoyed a famous Champions League win at Real Madrid last month.
Inside Futbol says Di Matteo is on West Ham United's shortlist of candidates to succeed Sam Allardyce.
Allardyce is off contract in June and there is no guarantee the board will seek to renew their agreement.