The 26-year-old, who has also played for Cercle Brugge, MVV, Cambuur Leeuwarden and FC Twente, has an option in his contract for two further seasons.
Coach and technical director Andries Jonker told www.willem-ii.nl: "Muhamadu is a player with speed, he is two footed, has good individual skill and he is always dangerous near goal."
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