Luke Shaw has "no excuse" for not being in the right condition to play for Manchester United, says former England defender Danny Mills.
Full-back Shaw, 21, has had his commitment and focus questioned by manager Jose Mourinho.
He has only played 15 times for United this term and has not figured since the 1-1 draw with Bournemouth on 4 March.
"It is all about discipline, dedication and desire," Mills told BBC Radio 5 live's Monday Night Club.
"It appears Luke Shaw isn't giving it his all. He has all the ability in the world but it all comes down to attitude.