Answer
Yes, Lassad did play for Celtic. He was signed by Celtic from Lyon in January 2012 and made his debut for the club in a 1–1 draw with Dundee United on 19 January 2012. He scored his first goal for Celtic in a 2–0 win over Kilmarnock on 10 February 2012. He left Celtic in January 2014 after making 50 appearances and scoring 9 goals for the club.