A regular with OH-Leuven, Nyakossi is on West Ham's shopping list this month.
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West Ham have been following Nyakossi this season and will have to act quickly with interest also arriving from Serie A and the Bundesliga, says The Sun.
Portsmouth made a £1.5m attempt over the summer, which was immediately rejected by OHL.
OHL rate their youngster at a far higher price and are prepared to sell for the right offer over January.