Bruno Fernandes credited Alejandro Garnacho for improving his previously poor attitude after the teenager marked a rare Manchester United start with the winner against Real Sociedad.
Garnacho was named United's under-18 Player of the Year last season but has largely remained on the periphery of the first-team squad under Erik ten Hag this campaign.
The teenager proved his worth on Thursday, though, scoring his first senior goal for United with a first-half strike in a 1-0 win at La Real in the Europa League.
While the 18-year-old will hope to feature more for Ten Hag at Old Trafford now, Fernandes says he must continue with a much-improved attitude after failing to impress in pre-season with the senior side.
"He was good but he knows we expect at lot from him. He's still really young. He's doing really well," the Portugal international told BT Sport.
"At the beginning of the season, not at his best, in the tour he didn't have the best attitude that he should have and that's why he didn't get his chances until now.
"Now he's getting chances because he's training better, he's having a better attitude and he deserves his chances."
Garnacho's strike may earn him a share of the plaudits but United still had to settle for second in Group E after Imanol Alguacil's side topped the pool by virtue of a better head-to-head record.
Juventus and Barcelona, both sides to be eliminated from the Champions League, could await United in the Europa League's knockout play-off round, with the draw set to take place on Monday.
Despite not progressing as winners of the group after failing to secure the two-goal win that was required, Fernandes believes the victory will offer Ten Hag's side encouragement.
"Obviously, we knew that we needed a two-goal difference to go through at the top of the group, but it was not possible," he added.
"But we won the game, we keep the momentum, we didn't concede a goal once again, so we have to keep the positives of this game, and there are many positives – much more than negatives.
"So it's just [about] keeping the momentum on Sunday [when United visit Aston Villa in the Premier League]."
'Legend' Van Nistelrooy departs Man Utd after Amorim arrival
Manchester United have confirmed Ruud van Nistelrooy has departed the club following Ruben Amorim's arrival at Old Trafford.
Van Nistelrooy returned to the club in July on a two-year contract as an assistant to Erik ten Hag.
He was placed in interim charge after Erik ten Hag's dismissal last month.
The 48-year-old oversaw four games during his temporary tenure, earning victories over Leicester City in the EFL Cup and PAOK in the Europa League. United were then held to a 1-1 draw by Chelsea, but Van Nistelrooy signed off in style with a 3-0 win over the Foxes in the Premier League on Sunday.
But Amorim, who began his new role on Monday, has decided against retaining the Dutchman's services, with the club saying the full men's first team coaching composition will be announced in due course.
"Ruud is and always will be a Manchester United legend," the club said in a statement.
"We are grateful for his contribution and the way in which he approached his role throughout his time with the club. He will always be very welcome at Old Trafford."
Assistant Rene Hake, goalkeeping coach Jelle ten Rouwelaar and analyst Pieter Morel have also left the club.
However, former United midfielder Darren Fletcher will remain in his coaching role and continue his link between the first team and the academy.
Pereira replaces Amorim as Sporting head coach
Sporting CP have confirmed Joao Pereira as the club's new head coach following Ruben Amorim's departure to Manchester United.
Pereira, who made 154 appearances across three different spells with Sporting, has put pen to paper on a deal that runs through until 2027 with the Primeira Liga champions.
The 40-year-old also appeared five times under Amorim during the 2020-21 season, a campaign that saw Sporting claim their first top-flight title in 19 years.
Pereira has previously managed Sporting's Under-23 side, taking charge of 53 games and winning 20 of those (D17 L16), averaging 1.45 points per match.
He most recently took charge of Sporting's B team, but oversaw just 11 matches, and he is relishing the opportunity of leading the club after the international break.
"As a player, Sporting gave me a lot, allowing me to play for the national team, join one of the best leagues in the world and return home twice," Pereira said.
"I only repaid them with a Super Cup and a national championship, which felt more like their gift to me.
"That’s something I regret, so as a coach I’d like to repay them with more titles because Sporting deserve it.
"If I had doubts and thought things might go wrong, I wouldn’t be here. It hasn’t even crossed my mind that it could go poorly.
"I know we’ll face challenges, but I believe it will go well."
But Pereira has a tough act to follow, with Amorim ending his glittering stint with the club on a high after a 4-2 win over Braga on Sunday.
Amorim won 164 of his 231 games in charge of Sporting, averaging a win percentage of 71%, which is a club record.
During his time in charge, only Manchester City (127) won more matches than his Sporting team (122) across Europe's top 10 leagues.
"Ruben leaves behind a legacy, and that legacy isn’t only in titles, victories, and records but also in the unity he built among the Sporting family," Pereira added.
"I know this brings great responsibility, but that responsibility comes hand-in-hand with a strong ambition and motivation to continue making Sporting a winning club with a bright future.”
Pereira's first assignment will come in the Taca de Portugal against fourth-tier side Amarante on November 22, before welcoming Arsenal to the Estadio Jose Alvalade in the Champions League five days later.
'I'm not naive', says Amorim as he relishes 'difficult' Man Utd challenge
Ruben Amorim insisted he was "not naive" about the "difficult" task awaiting him as Manchester United's new head coach.
Amorim took charge of his final game as Sporting CP's manager on Sunday, culminating in a 4-2 away win against Braga to maintain their perfect start to the Primeira Liga season.
The 39-year-old ended his glittering career with the Portuguese side having won 164 of his 231 games at the helm (D34 L33), bowing out with a win percentage of 71%, a club record.
Amorim arrives at Old Trafford after a string of impressive results under interim boss Ruud van Nistelrooy, who went unbeaten across his four games during his temporary stint.
Though the Portuguese's arrival at the club and the positive results of late have lifted the mood in Manchester, Amorim acknowledged the enormity of the task at hand.
"I feel ready for the new challenge," Amorim told reporters after his final match at Sporting. "I'm not naive, I know it's going to be very different, very difficult.
"I'm at peace now. I can focus on my new job, and I'm looking forward to starting tomorrow.
"I know it will be difficult to reproduce what I have here anywhere else, but there are other places with different exposure and pressure."
United are yet to confirm the precise nature of Amorim's backroom team and whether Van Nistelrooy will remain at Old Trafford.
The Dutchman returned to Old Trafford in July as an assistant coach under former boss Erik ten Hag, signing a two-year contract.
"I have to talk with him [on Monday]," Amorim added. "I will explain everything. I'm very clear, and I will tell you like it is. So let's wait."
Amorim now has 13 days during the international break to prepare for his match in charge, which comes at Portman Road against Ipswich Town on November 24.
His first Old Trafford outing comes four days later in the Europa League against Norwegian champions Bodo/Glimt.
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