The Parkhead men trail their star-studded hosts at the top of Group G by two points after two games but few expect an away win, even though Barca coach Tito Vilanova has something of a defensive crisis on his hands with Daniel Alves, Carlos Puyol, Gerard Pique and Eric Abidal all expected to be missing.
The Hoops boss acknowledged the magnitude of the task in hand but is keen to ensure his players go into the game in the right frame of mind.
``It is exciting times for the players and the club and the supporters as well,'' he said. ``But we are not here for a holiday. We are not here for the tourist attractions.
Scott Brown (hip), James Forrest (groin), Georgios Samaras (elbow) and Kris Commons (hamstring) returned to the squad after missing Saturday's 5-0 Clydesdale Bank Premier League win over St Mirren in Paisley.
Defenders Adam Matthews and Kelvin Wilson picked up respective knee and calf complaints during the win over the Buddies and will also be assessed at training while Lassad (groin) and Dylan McGeouch (knock) did not travel.
Barca have not lost a game in La Liga or the Champions League this season and sit top of Group G with maximum points after two games.
However, at the pre-match press conference at Barca's famous old stadium, Vilanova was quizzed repeatedly about the defensive crisis he has on his hands with Gerard Pique joining Daniel Alves, Carles Puyol and Eric Abidal on the sidelines while midfielder Sergio Busquets is suspended.
After conceding four goals in a 5-4 win over Deportivo La Coruna at the weekend, midfielders Alex Song and Javier Mascherano look set to form a makeshift central defence again.
Vilanova tried to play down the significance of his injuries but admitted concerns.
``Injuries are normally a headache for a coach but we have got what we have got,'' he said. ``And all the players are at the right level to play for Barcelona.
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