It was a night of overwhelming positives for United. Mainoo, starting his third successive match at the Euros, stole the show until Ollie Watkins' last-gasp winner grabbed the headlines.
Meanwhile, Luke Shaw continued his return to fitness by making his second substitute appearance in five days, replacing Kieran Trippier at half-time in Dortmund.
As a nervy contest entering its dying embers, Watkins, 10 minutes after replacing Kane, produced an incredible touch and finish as the game entered stoppage time, sending England to Sunday's final in Berlin.
Matthijs de Ligt was an unused substitute for the sixth consecutive game at Euro 2024, while Joshua Zirkzee was handed a 93rd-minute cameo from the bench as a last roll of the dice.
Joshua Zirkzee is set to join Man Utd. (Image: Getty)
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Both could be team-mates at club level by the end of next week as United close in on their signatures. De Ligt and Zirkzee's Euro exit opens the door for those transfers to be completed.
According to the Manchester Evening News, United have verbally agreed personal terms with De Ligt and are optimistic about concluding a £42million deal with Bayern Munich.
New Bayern boss Vincent Kompany is said to have sanctioned the 24-year-old defender's departure as he eyes Bayer Leverkusen's Jonathan Tah.
United have also identified Zirkzee as their priority target to replace Anthony Martial and offer Rasmus Hojlund the support and competition he went without last season.
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Fabrizio Romano claims a five-year contract has been agreed with the Bologna striker, as well as a commission for his agent, Kia Joorabchian. The latter of which derailed AC Milan's hopes of a deal.
Erik ten Hag's non-international players returned to Carrington on Monday, with the first game of pre-season taking place in four days against Rosenborg in Norway.
United face Rangers in Edinburgh on July 20 before flying to the United States for their pre-season tour in the week commencing July 22.
The Red Devils' representatives at Euro 2024 and the Copa America will likely join at that stage. There is an increasingly likely chance that De Ligt and Zirzkee will be among the travelling party.