The 19-year-old was the Belgian Jupiler League's joint top-scorer this season, with 22 goals for Eupen, although the club ended the campaign in 13th spot out of 16 teams.
Eupen have bids from Anderlecht and Club Brugge while the exhaustive list of clubs to have made other offers includes Arsenal, Red Bull Leipzig, Schalke, Borussia Dortmund, Monchengladbach, Lyon, Lille, Monaco, Nice, Atletico Madrid, Sevilla, Fiorentina and Roma.More news: LeBron James' Cavaliers embracing underdog status in NBA Finals rematch with Warriors
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The Premier League interest in the red-hot striker could bring to an end Celtic's hopes of snapping him up.
Belgian giants Anderlecht and Club Brugge have also indicated interested but the Nigerian striker has insisted he wants to play in England.