 Assou-Ekotto contributed with 11 matches in the first half of the 2005–06 campaign to Standard Liège's runner-up position, before joining Willem II from the Netherlands in the following winter transfer window.In yet another January move, he signed for former club Mouscron – first joining on loan – going on to play with the Hainaut side until they folded in December 2009.The following February, Assou-Ekotto resumed his career at Boussu Dour Borinage in the Belgian Second Division.