Shambolic City beaten 3-1 by minnows Bodø/Glimt as Høgh bests Haaland in Norway
Guardiola's side found themselves facing a possible Champions League play-off fixture after 3-1 loss in Erling Haaland's backyard
Manchester City have been condemned to a second-straight defeat as Erling Haaland was ineffective in stopping Bodø/Glimt from running riot on a return to his native Norway.
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After a pitiful display in Saturday's Manchester derby, Pep Guardiola's side simply never showed up for a game which could have seen them avoid the Champions League play-off round.
Midfielder Rodri saw red after two yellow cards in two minutes in the second half, but this only compounded City's woes in the Arctic Circle.
Danish striker Kasper Høgh scored two first-half goals after capitalising on mistakes from young centre-back Max Alleyne.
Jens Petter Hauge then put the giants to the sword in the second half, before Rayan Cherki pulled back a consolation goal for the visitors.
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Having entered the evening hoping to secure a top-eight finish and spot in the Round of 16, City now face a crunch clash against Turkish giants Galatasaray in their final league phase match next week.
City could make excuses about the climate, a string of absentees or the artificial surface, but they were ultimately outplayed.
Erling Haaland, on his return home, was again kept quiet as Bodø produced one of the best results in their history.
City was without 11 senior players due to illness, injury, suspension or ineligibility.
Nevertheless, the manner in which Bodø repeatedly troubled them on the break was alarming.
They had a warning when Bodø's pacey forwards got behind the defence, which again featured inexperienced centre-backs Abduokodir Khusanov and Alleyne, but failed to capitalise.
Typically City controlled a lot of possession, but despite winning a series of corners, could not test home goalkeeper Nikita Haikin.
Alleyne spurned a chance when he missed a header from a corner, and things got worse for him as Bodø pounced on two errors in quick succession.
Alleyne first missed a tackle on the halfway line that allowed Bodø to counter. Ole Didrik Blomberg raced into the area and recovered his footing after a collision with Khusanov to chip a cross to the far post.
Høgh headed firmly past Gianluigi Donnarumma and doubled his tally less than two minutes later after another Alleyne mistake.
This time, the Under-21 international dwelled too long on the ball, and Blomberg again got clear to tee up Høgh for a tap-in.
Høgh almost had a hat-trick after getting on the end of another pass moments later, but this time Donnarumma saved.
City missed chances to level as Rodri fluffed a header and Haaland shot narrowly wide.
Tijjani Reijnders also fired at Haikin early in the second half but Bodø threatened again as Hakon Evjen tested Donnarumma.
Rodri then endured a nightmare few minutes, starting as he gave the ball away in the build-up to Bodø's third. Hauge powered forward and curled a fine shot into the top corner from distance.
City replied immediately as O'Reilly won the ball outside the Bodø area and Cherki drove in a deflected low shot.
But Rodri was booked twice in quick succession, the second time for pulling back Blomberg, and was dismissed.
Bodø sensed a chance for more and Hauge hit the bar before Hogh had another disallowed for offside.
City wanted a penalty after Cherki went down in the area but their appeals were dismissed and Bodø claimed a deserved win to give them hope of qualifying for the knockout phases.