Celtic have been hit by an injury blow to left-back Emilio Izaguirre, who will miss Wednesday night's Champions League game against Barcelona and may not return until just before Christmas.
Izaguirre has been ruled out for six weeks with a hamstring injury after being forced off in Celtic's 2-2 draw with Dundee United at the weekend. And the Bhoys have also lost Thomas Rogne for two weeks with a calf injury suffered in the same match.
James Forrest (hamstring) and strikers Gary Hooper (hamstring), Lassad (groin) and Georgios Samaras (ankle) missed the trip to Tayside too.
Celtic boss Neil Lennon said: "Izaguirre is out for six weeks. He had a scan yesterday. Rogne is looking at two weeks with a calf strain. James Forrest will be out for a week or two with a hamstring strain. Lassad has a groin strain.
"Samaras is hopeful but Hooper is very, very doubtful so we are a little bit stretched.''
Information from the Press Association was used in this report