According to Sky Sport, the initial payment, along with performance-related add-ons, will surpass the £5 million Motherwell received from Udinese for Lennon Miller last summer.
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The 26-year-old New Zealand international is expected to travel to Wales this week for a medical.
Personal terms have yet to be finalised, but they are not expected to present any problems.
Just arrives after impressing at the World Cup, where he scored three goals for New Zealand.