“You have to keep it up every time and challenge yourself,” he said. “He has to prove himself and show himself off the field.

“After training, what do you do? Do you go to the gym or in 10 minutes are you in your car? That’s how eager you are to reach the highest level. It’s sweating to be a professional. Your career is very long still, but you have to put much more effort in it. Not only think your talent is enough. Talent is important, but it’s more important that you have character. Combined with talent, you can be a very good player.”

As punishment, de Boer assigned Carleton to travel with Atlanta United 2 for its game at Loudon last week. However, de Boer said he told Atlanta United 2 manager Stephen Glass to let Carleton warm up, but not to play him.

“He had to feel that it’s not acceptable what he did,” de Boer said. “Now it’s over and he understands it and now he has to respond, of course, to himself, to his teammates and to me.”

Atlanta United will play at Chicago on Wednesday.