Champions League return clash against Midtjylland in Denmark. But the Parkhead boss still his to look to strengthen in the long term with the fingers already starting to be pointed at the Hoops board if they fail in Europe's premier competition.
And Record Sport have exclusively revealed how Derby County defender Lee Buchanan is on the former Australia gaffer's radar.
The rearguard is the priority as the 6-2 thumping by West Ham United proved at the weekend but Nottingham Forest are also reportedly keen on 20-year-old Buchanan.Celtic look more impressive going forward under Postecoglou but that won't stop them looking and they have been linked with a move for Gorica attacker Kristijan Lovric.
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