He had surgery in November, but Liverpool are concerned he is not progressing as they expected and the Spaniard has now flown back to America to consult famed knee specialist Richard Steadman.
"Jose is still in America - he has been over there getting some treatment," he said.
"He hasn't had another operation, it's just a case of continuing with his rehabilitation.
"He's seeing a specialist as the knee hasn't got better as quickly as we hoped.
"I still hope he will play again this season. Hopefully when he comes back from America we will have some good news."
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