The Ivorian forward is highly rated after scoring 31 goals in 30 games last season for the Dutch side.
Chelsea and Newcastle are among the other teams interested in a player who seems likely to be in the Premier League next season.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.