"It's more of a cultural problem than anything else," the Argentine said on Espanyol's website.
"We are talking to the club to see how we can help him and find a solution. He has been here for quite a few months and the adaptation is taking longer than expected."
Nakamura, who joined from Scottish side Celtic in the close season, has played in 10 of Espanyol's 14 matches this term but has not scored and did not feature at all in the 1-0 defeat at city rivals Barcelona last weekend.
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