It was a completely changed United lineup from the side that won at West Ham in the Premier League on Sunday so Cristiano Ronaldo did not feature.
The 21-year-old Sancho has had a slow start to his stint at Old Trafford, struggling to make an impact in his first five appearances.
Solskjaer -- who won multiple trophies during his time as a player at Old Trafford -- is yet to win silverware as United manager despite several near-misses.
Raheem Sterling thought he snatched victory with a last-gasp strike but the flag was raised for offside and VAR confirmed the decision.
Kevin Parker, the general secretary of City's official supporters club, said Thursday that Guardiola should be more appreciative of the cost for fans in time and money of attending matches.
But the pressure is on under-fire Arsenal boss Mikel Arteta when the Gunners travel to fellow strugglers Burnley.
The same kind of problems carried over from last season’s failed campaign to the one that started badly in Switzerland, errors in defense plus lapses of discipline leading to an ill-timed red card.
Reduced to 10 men in the 35th minute after a red-card foul by Aaron Wan-Bissaka, the Premier League co-leader struggled to create any more scoring chances against the unheralded Swiss champion.
Cristiano Ronaldo's first Champions League game for Manchester United since losing the 2009 final to Barcelona will be on the only plastic pitch in the competition.
RB Leipzig, last season's Bundesliga runners-up, have lost three of their first four league games after Saturday's 4-1 home defeat to Bayern Munich.
Cristiano Ronaldo returned to Manchester United in a blockbuster move from Juventus last month, 12 years after leaving Old Trafford to join Real Madrid.
The fifth Test between India and England at the Old Trafford was cancelled after Virat Kohli refused to field his team apprehending more cases during incubation period.
The final match of the series was cancelled when a physio in the Indian camp tested positive ahead of the game, making the visiting players apprehensive, though all of them tested negative.
Cristiano Ronaldo surpassed even his own expectations as he delivered on the hype of his return to Old Trafford as a Manchester United player.
Jamie Vardy had a goal for Leicester disallowed for offside, while Harvey Barnes hit the bar for the hosts as their mixed start to the season continued.