David De Gea has offered advice Benfica counterpart Mile Svilar ahead of their Champions League meeting on Tuesday.
The Belgia became the youngest goalkeeper in Champions League history at just 18 years, one month and 22 days when the two sides met in Portugal.
However, his mistake handed United the three points as the teenager carried a Marcus Rashford free-kick into his own net.
“Yes, I did have sympathy for him,” De Gea told the official Manchester United website. “But then that’s the life of a goalkeeper for you.
“It can be tough especially when you are so young and make a big mistake – but in the end you just have to live with it and learn from the errors that you make. He’s just a young lad and he’s only just starting out his career and I’m sure he’ll be fine.
“The main thing is, if you do make a mistake, you should try to quickly forget about it and just keep going. At the end of the day when you are so young you get used to any mistakes you make and you just have to cope with them.
“You have to work very hard and enjoy what you do.”
Jose Mourinho also heaped praise on the 18-year-old, saying: “He is very good. In the next match after us, he kept a clean sheet and the same again at the weekend. He has a good personality and is a good goalkeeper.”