Hoffenheim midfielder Boris Vukcevic remains in a critical but stable condition in hospital following a car crash two days ago.
The 22-year-old is still in a coma after two nights in a Heidelberg clinic following the accident, which occurred while the player was on his way to training.
He remains in intensive care, his club confirmed, and his condition "remains critical", but he is in "the best possible hands," according to Hoffenheim's general manager
"We have discussed how we should deal with the situation. We know that Boris is in the best possible hands and all we can do is hope that his condition stabilises itself further," he said.
Hoffenheim fulfilled its Bundesliga fixture against Augsburg, managing a 0-0 draw, and the players have now been given two days off before returning to training early next week.
"The players should remain with their families and try to clear their minds as much as possible," said Muller.
"Of course they have the opportunity of coming into our training centre whenever they want."
Jupp Heynckes has hinted he may continue coaching elsewhere after guiding Bayern Munich to UEFA Champions League glory.