The 21-year-old, who can play as a striker or out wide, scored seven goals in the Belgian top-flight last season.
With Danny Welbeck leaving the Gunners this summer, manager Unai Emery is on the hunt for a replacement.
Turkish outlet Fanatik claim Arsenal and Lyon have submitted a £12million bid, while Fenerbahce are keen on the versatile attacker.
Dennis could be playing at the Emirates next season, so who is he?
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