West Ham are planning to talk to Enner Valencia about an interview he has given to a Ecuadorian radio station criticising the way the club has dealt with his injury.
"I have tried to ask an external doctor but the doctor of West Ham doesn't want me to ask another doctor," Valencia told La Deportiva.
"It's my health we are talking about here. I have been injured for a month and I still don't know what the name of my injury is."
Sources at West Ham have refuted the claims to Sky Sports News HQ, insisting the striker has been given the highest possible medical care.
The club will sit down with Valencia as soon as possible and also listen back to the interview in full to see whether anything has been lost in translation.