Celtic have to improve sharpish and told his despondent players to use their Bayer Leverkusen thrashing to "fuel some fire" to turn things around.
The Hoops boss watched his side ship another four goals as they slumped to a second successive Europa League group stage defeat.
It’s now just two wins from eight games for the Aussie who takes his side for a huge Pittodrie pressure game against Aberdeen on Sunday.
Postecoglou was visibly gutted as spoke after the Parkhead pummelling at the hands of the German giants.Celtic missed some gilt-edged chances and met an opposition goalkeeper in inspired form but Postecoglou knows there is no room for excuses as a sell-out crowd was let down.He admitted: “We have to get better soon.
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