Danijel Pranjic's agent admits the time has come for his client to take on a new challenge.
The Croatian international is currently on the books of Eredivisie side Heerenveen.
He has enjoyed a productive season in Holland, bagging 15 goals in 22 appearances.
Such sparkling form has seen him catch the eye of a number of clubs across Europe.
West Ham are believed to be leading the race for the midfielder's signature, although Sunderland and Real Betis are also reported to be showing an interest.
"Danijel has not decided anything yet but it may be time for him to move to a league of higher quality," said Pranjic's representative Kaj Lerby.
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