The goalkeeper, who succeeded Gianluigi Buffon as the club’s no.1 goalkeeper, parried the ball into Alex Sandro who bundled it into his own net for the winner in the final moments of the game.
Minutes earlier Juan Mata gave Szczesny no chance when he equalised with this brilliant free-kick.
On United’s winner, Scholes said: “I think that is bad goalkeeping. He could come out but he’s indecisive and I think that is their big weakness.
“He struggled for five years at Arsenal and it doesn’t look like he has improved for me.”
Sitting next to him, Owen Hargreaves agreed with Scholes and suggested winning a competition like the Champions League is a tall order without an elite ‘keeper.
“Scholesy makes a great point about the goalkeeper. How many sides have won the Champions League without a world class goalkeeper?
“This team is ready to win the Champions League and people behind the scenes will be thinking have they missed a trick now Buffon has left.”
Szczesny joined Juventus from Arsenal in 2017 in a £10m transfer having spent the previous two seasons on loan at Roma.
Having joined the Gunners as a teenager in 2006, the 28-year-old played a total of 181 games for the club, but lost his place to David Ospina, with Petr Cech’s arrival pushing him further away from the no.1 shirt.
Before the United game, the goalkeeper appeared to annoy team-mate, Paulo Dybala during the warm-up when he smashed a ball – accidentally – on the back of the striker’s head.
The win keeps Jose Mourinho’s men in second place with seven points, two clear of Valencia and two behind leaders Juventus with two games remaining.
Man United’s remaining Champions League fixtures
27 Nov: Man United v Young Boys
12 Dec: Valencia v Man United
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