Celtic’s preparations for their crunch midweek Champions League qualifier against Midtjylland took a knock with a 6-2 friendly defeat by West Ham at Parkhead.
Hoops skipper Callum McGregor curled in an early opener on Saturday before Hammers striker Michail Antonio scored a quick-fire double and captain Mark Noble netted from the penalty spot.
Ryan Christie pulled a goal back for Postecoglou’s side five minutes after the break but Said Benrahma replied for West Ham and Celtic then made 10 substitutions before Jarrod Bowen and substitute Armstrong Okoflex, signed from Celtic this summer, added two more.
Postecoglou now has to get his players ready for the second leg of their second qualifier on Wednesday night after a 1-1 draw against the Danish side during the week, and the tightening of defence will be a priority.