Argentina teenager Alejandro Garnacho came off the bench to score in stoppage time as Manchester United won 2-1 away to Fulham on Sunday.
It seemed the Cottagers had done enough to earn a point in the final Premier League match before the World Cup break.
But Garnacho's expert one-two with Christian Eriksen, in the last of three minutes of added-on time, finished with the 18-year-old racing into the box before producing a cool finish across Bernd Leno.
"He has a lot of talent and his work-rate together with the talent makes a big difference with us from the bench," United captain Bruno Fernandes told the BBC when asked about Garnacho.
"We are really happy for him and know he can give us goals, assists and prove the joy of football."
Eriksen had put the visitors in front in the 14th minute at Craven Cottage with his first goal for United as he finished off a counter-attack.
Former United striker Daniel James equalised for Fulham just after the hour, having only come on as a substitute for Harry Wilson minutes earlier.
"About time!," said Eriksen of his goal. "I owed a few so I'm happy to be on the scoresheet in the last game before the World Cup. It's been a good week."
United remained fifth but this win meant they moved to within three points of fourth-placed Tottenham as Fulham stayed ninth.
