The Moroccan cut inside and drilled home in the second half against Lazio, but his side were already 3-0 down and went on to lose 5-1. They remain bottom of the table.
Lazaar, who wears the number 77 shirt at the Stadio Ciro Vigorito, played the whole game.
On Saturday, Matz Sels kept his place after saving a penalty in midweek and helped Anderlecht to a 3-2 win against AS Eupen.
Meanwhile it was another good afternoon for Stuart Findlay's Kilmarnock who followed up their midweek draw at Ibrox with a 1-1 draw at league leaders Celtic.
And there was a clean sheet for Callum Williams as Gateshead drew 0-0 with Dover in the Vanarama National League.
Adam Armstrong's Bolton were denied a much-needed victory by a late Fulham equaliser at Craven Cottage. Sammy Ameobi had put the Trotters ahead, with Armstrong playing the whole game.
Alex Gilliead completed 90 minutes as Bradford beat Portsmouth 1-0 in League One while Ivan Toney started and played for 80 minutes as Wigan drew 0-0 with ten-man Blackburn.
Sean Longstaff - who celebrated his 20th birthday on Monday - was replaced after 58 minutes as Blackpool lost 1-0 at Northampton.