RALSTON SET FOR RETURN
win over Ross County and is a major doubt for the Group G opener in Seville.
The left-back missed the Rangers game through the injury and now looks to have suffered a recurrence.
Taylor has been sent to see a specialist to try to get to the bottom of the issue but it looks like the next European outing could come too soon.
The positive news for the Hoops boss is Ralston is now back in full training and will be available for the trip to Spain to give Postecoglou options for cover at full-back if Taylor doesn’t make it.
Ralston’s return could see Josip Juranovic moved to left-back in the set-up the Celtic boss adopted against Rangers or he has the option of throwing in Adam Montgomery, who came off to replace Taylor at the weekend.
Celtic boss Postecoglou also has concerns at the top end of the pitch.
Kyogo Furuhashi is out for around a month with a knee injury that he suffered on international duty with Japan.
New signing Giorgos Giakoumakis also still to make his debut for after missing the Premiership victory over the Staggies.
It remains to be seen if the Greek frontman will be available for Thursday. If he isn’t then it would leave Albian Ajeti, who scored a double at the weekend, as the club’s only out and out striker.