http://www.playerhistory.com/Default.as ... erID=15086

Is there any source confirming his spell in Mexico (maybe on trial)?

Here you can find León's past squads in first division. Luc Sonor doesn't appear in 1996-97.
http://www.mediotiempo.com/equipo.php?id_equipo=164

A second list (complete, to my knowledge) of all foreign players of the club, the only french being Amara Simba (Verano 97):
http://www.verdiblanco.com/clubleon/ind ... &Itemid=65

And finally the newspaper "El Informador", the last entry for his name is on 18/01/1992.
http://www.hemerotecainformador.com.mx/

Anyone knows more?
Thanks in advance

I did not find him in Mexico.