"We can't keep using the excuse that Garnacho is young. He is not young anymore, at least not in football. He turns 21 in the summer and before he knows he will be 30. He needs to understand that and start performing," he told SpilXperten.
"He is not playing like an adult and he is certainly not acting like an adult, and he has to have a good look in the mirror, to tell himself that he needs to stop thinking about being the next Ronaldo. He will never be that, so he has to accept the fact that he needs to work hard to get a decent career."
He added: "I liked him when he came through and he had that Argentinian fire in his belly, which he has lost completely. He has let himself and his family down. He has let his club down, because he is not taking advantage of the talent he was supposed to have. I am not seeing anything from him. The most important thing for him now is to understand what he is good at and what he is bad at.
"He can't take on people, he is not quick enough and he doesn't want to work hard. So, what is he actually good at? He needs to figure that out and show it, rather than just wanting to be the next Ronaldo. Because at the moment, to me, he just seems like a Ronaldo fanboy, who would rather make a few highlights to post them on social media rather than winning football matches and make this club great again."