Aged 17 years and 23 days, Shoretire broke the record set by Norman Whiteside, who was 108 days older, when he entered United’s game against Real Sociedad in place of Mason Greenwood.
Whiteside made his debut for United in Europe in the UEFA Cup against Valencia on September 15, 1982.
An elated Shoretire, a product of United’s academy, took to his Twitter account to express his delight at being United’s youngest player in a European competition.
“What a feeling to make my European debut! To become United’s youngest ever player in Europe is an incredible honour and a proud moment for me and my family! On to the next round #MUFC,” he tweeted.
United manager Ole Gunnar Solskjaer also hailed the teenager for his exploits.
“Shola’s got some skills, attributes that we think are going to make him a very good player here.
“It’s a platform of course tonight – just 15 minutes – so it’s something to build on, something for him to remember at Old Trafford. If the fans had been here, he would have enjoyed it more because they give you so much more energy. Football is strange at the moment, it is different, but I’m sure all the fans will see him later on,” Solskjaer said after the game.
February will be a month to remember for Shoretire as he signed his first professional contract with United on February 8, before being named in the senior squad 10 days later.
He also made his senior debut for United in their 3-1 victory over Newcastle United on Sunday, coming in for Marcus Rashford.
That also meant he became the second-youngest player to represent the Reds in the Premier League, aged 17 years and 19 days, with only Angel Gomes doing so at a younger age.