Cristiano Ronaldo scored again for Manchester United, but they were beaten 2-1 late on by Young Boys in their Champions League opener after Aaron Wan-Bissaka's red card.
Manchester United conceded a dramatic stoppage-time goal as they lost to Young Boys despite Cristiano Ronaldo scoring on his Champions League return for the Red Devils.
Ronaldo, who became the joint all-time Champions League appearance holder on his 177th appearance in the competition, fired Man United ahead after an exquisite pass from fellow Portuguese Bruno Fernandes.
United played for almost an hour with 10 men after Aaron Wan-Bissaka's dangerous challenge on Christopher Martins earned the defender a straight red card.
They looked set to hang on for a point in an entertaining match after Cameroon winger Moumi Ngamaleu's equaliser. But a 95th-minute mistake by substitute Jesse Lingard – who had replaced Ronaldo with 18 minutes left – allowed Jordan Siebatcheu to score the winner for the team that had to come through qualifying to reach the group stage.
The home fans celebrated wildly while Ole Gunnar Solskjaer was left to reflect on a performance which saw United muster just two shots, the fewest Opta have on record in any of their 138 Champions League matches since 2003-04.
Having missed out on qualifying for the knockout stages of the competition last season, Man Utd now host Villarreal in their next Group F game on Sep 29 in a repeat of last season's Europa League final.
* Young Boys defeated Manchester United 2-1 in the Champions League
* It was Ronaldo's 177th Champions League appearance
* Young Boys coach David Wagner says it's "very special" to have beaten one of the giants of European football