Ange Postecoglou is already coming under pressure at Celtic after early results. The Australian secured the first competitive win of his reign against Jablonec as he looks to have guided the side to the next Europa League qualifier round.The 4-2 victory in the Czech Republic comes after an opening day Premiership defeat to Hearts and the Champions League flop against Midtjylland.There was also warning signs going into the clash with Dundee United on Sunday after Jablonec netted two soft goals in the first leg.Stewart told BBC Sportsound that the defensive frailties could be a huge problem despite the additions of Carl Starfelt and Joe Hart.
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