The Parkhead boss admitted he hoped to see a busy end to the summer window after defeat to Kilmarnock.
Celtic are just three games into their season and Brendan Rodgers has already seen his hopes of another Treble collapse in Ayrshire.
But what areas are suffering most from the loss of "quality" players at Celtic Park? Record Sport takes a look at a whirlwind six months in the market for Celtic. Carl Starfelt left this summer for Celta Vigo after forming a key partnership with Cameron Carter-Vickers during the last two title-winning campaigns. Gustaf Lagerbielke and Maik Nawrocki have been snapped up to add depth at centre-back, while forgotten Stephen Welsh has been brought back in to first-team contention by Rodgers. The Scotland U21 cap appeared to be on the way out of Parkhead under Postecoglou - but has been handed a contract extension by his new boss.
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