Eric Botem and Ola Solbakken scored two goals each for the host team, which led 2-1 in the first half and dominated the match completely after the break to stun the Italian team.
This is the first time in 1,008 matches during his coaching career that a team led by Mourinho has scored 6 or more goals.
Mourinho rested a number of his prominent players, and perhaps he was a Yemeni with an easy night in Norway, but he paid the price.
The 58-year-old Portuguese coach told Sky Sports: “I decided to play in this squad, so I take responsibility. I did it with good intentions to give the hardworking a chance to play and follow the rotation policy.”
This defeat may not have been as painful for Mourinho as Real Madrid’s humiliating 5-0 loss to Barcelona in 2010, but Roma, who started the European Conference with two victories, are currently second in their group by six points, one behind Bodo/Glimt.
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