Martinez has turned the lad into a nervous wreck.
Lukaku last season = cant trap a ball + cant hold the ball up.
Barkley last season = Lets sell hes another rodwell etc
Besic = Poor signing and average inconsistent player
Deulofeu = Selfish player
The list goes on and on, if anything Martinez gives young players responsibility and plays to their weaknesses for short term loss but long term gain...see barkley out of position last season of lukaku having to hold the ball up due to martinez wanting them to develop.
Same with Stones, senior centre back next to Mori for most of the season. The crowd gets on his back when he felt he was in control and then gets a non penalty awarded against him and the disgracful decision against man city.
Martinez will not be hard on him but will help him learn from all this and next season he will move up a level like the others
He's 21 years old.