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The second half saw four of six Bodo/Glimt goals.
Jose Mourinho, former Spurs boss, was having a terrible time on a night in which Tottenham lost at Vitesse.
The Portuguese suffered one of the worst defeats in his managerial career, and it was certainly the most shocking. His Roma team were defeated 6-1 by Bodo/Glimt at the Europa Conference League.
Roma was just 2-1 behind at the break, after the Norwegian champions defeated Patrick Berg's curler and Erik Botheim. Carles Perez responded with a clinical effort.
Mourinho made three adjustments at the beginning of the second period, and added two more on the hour mark. Bodo/Glimt added a fourth with Botheim scoring from close range.
Mourinho and Roma suffered more as Ola Solbakken scored a fine solo goal to make it 4-1. Amahl Pelegrino added another and Solbakken took his second.
This is the first time that a Mourinho team has conceded six goals or more in a single match in the 1,008th match in his coaching career.
This defeat is in addition to the 5-0 loss Real Madrid suffered against Barcelona in 2010, which was Mourinho's worst managerial defeat.
Sky Sport Italia: "I chose to play with this lineup, so the responsibility lies mine."
"I did it with good intent, to give an opportunity for those who work hard, and to rotate the team on a synthetic pitch during cold weather.
"I never concealed the fact that we were a team with real limitations. There are 13 players on one team and the rest are on another level.
"We lost against a better team on the night. It's as simple as that.