West Ham are blocking Javier Hernandez's plans to return to Spain.
The Mexico international enjoyed a past loan spell with Real Madrid and has been in talks with Valencia about a move this month.
Real Betis and Sevilla are also in contact with Chicharito's management team.
However, West Ham are reluctant to part with the striker this month.
Hammers boss Manuel Pellegrini is counting on Hernandez for the remainder of the season.