Manchester United lose their first Champions League game even though Cristiano Ronaldo was on the scoresheet.
Ronaldo has now scored in two consecutive games for United in his return.
He is now the top goalscorer of the competition with 139 goals to his credit.
Wing back Aaron Wan-Bisaka got the marching orders which made Ole withdraw Sancho for Dalot.
The 36-year-old gave United the lead in the 13th minute and it looked like the Red Devils were going to win.
United went into the dressing room with a lead and in control.
However, Young Boys grew into the game and equalized in the 66th minute.
When it looked like the game would end in a draw, Young Boys stung United with a 95th goal from Siebatcheu.
ICYMI: Can Ole win with this team?
The Red Devils had only 2 shots on target in the game and looked far from impressive.
Manchester United lose their first Champions League game of the season and it is a reality check.
A lot of people were expecting the team to be unbeatable right now and Ole will be under pressure to win.
Many might blame Jesse Lingard for the winning goal scored by Young Boys in the dying minutes.
This is not a good start for Manchester United who were Europa finalists last season.