Manchester United veteran midfielder Casemiro believes Kobbie Mainoo will be a superstar in the coming years.
The teenager has already cemented his place in the Red Devils' midfield in recent weeks.
However, Casemiro believes that more game time and experience will bring out much more in Mainoo.
"First off, I'd like to congratulate Kobbie. He's only 18 and he's already a starter at a club like Manchester United," said Casemiro, in an upcoming episode of United's TeamViewer Diaries.
"It's not easy, there's a lot of pressure. But I think United will have a top player for the next years, easily. He's a top player. He's exceptional. He's a humble, hard-working player. He knows how to listen. He's a great player.
"Since I play alongside him, I know Manchester United will have one of the best midfielders in the Premier League for the next years, easily.
"I think we have to recognise his value. He's a great kid. I'm very happy that he's on our side. As long as he keeps his head on straight, just as he's doing now, I think we'll have a great player for many, many years here at United."