AC Milan vice-president Adriano Galliani has ordered the players into 'ritiro'.
Milan lost 3-2 to Lazio on Saturday and will spend the week at their Milanello base.
"I assume the responsibility for this action," said Galliani. "I do not know whether this measure will help.
"However, in the meantime, all of the players will be able to think about what is happening right now."