Leclercq was coach of Les Sang et Or between 1997 and 1999 and won the northerners´ only Ligue 1 title in their history, in 1998.
With the club third from bottom in the league and fighting to preserve their top-flight status, the 58-year-old - who played for Lens between 1974 and 1983 - has been drafted in to give assistance to coach Jean-Pierre Papin.
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