Diego, 23, left Bremen on Tuesday to join the Brazil squad in Singapore as they prepare for next month´s Olympics, despite not having permission from his club.
"I hope he comes back to Bremen immediately because he has an agreement with Bremen," said Frings. "If he does not stick to it, then there will be consequences from the club."
Copyright (c) PA Sport 2008, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms