Manchester United legend Roy Keane has concerns about the youngsters coming through at the club.
Keane was a pundit on Sky Sports for United's 2-0 loss at West Ham United on Sunday.
He spoke about the fact that United have not had a winning mentality at the club since the departure of Sir Alex Ferguson.
Keane mentioned the likes of Aaron Wan-Bissaka and Daniel James, who signed for United this summer.
"The only concern I have about the three players that came into the club is the clubs they came from," Keane said on Sky Sports.
"They're not used to winning week in, week out like you'd expect from Manchester United, and you also need the senior players that can give them a helping hand - and I've had doubts about that for a number of years."
