Celtic's preparations for their crunch midweek Champions League qualifier against Midtjylland took a knock with a 6-2 friendly defeat by West Ham.
Hoops skipper Callum McGregor curled in an early opener 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 Ange 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.
- Premier League pre-season friendlies - Fixtures and results
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.
West Ham looked sharp, particularly on the counter, and will carry on preparing for their Premier League opener away to Newcastle next month.
- Watch Superchargers vs Fire LIVE!
- Solskjaer: Man Utd still in contract talks with Pogba
- Red Bull say Max crash cost £1.3m | Team still mull penalty challenge
- Arsenal consider third bid for Ramsdale
- Download Instructions
- Solskjaer signs new Manchester United contract
- Arsenal transfer rumours: Is Lacazette on his way?
- Why Man Utd, Arsenal use set-piece coaches
- Joshua: I'll 'exploit' southpaw Usyk
- Pogba 'increasingly unlikely' to sign new Man Utd deal
Issa Diop replaced Angelo Ogbonna, who limped off injured just before McGregor easily brushed Manuel Lanzini off the ball and guided a shot from the edge of the box past goalkeeper Lukasz Fabianski.