AC Milan vice-president Adriano Galliani admits he has big concerns their season could collapse due fitness worries.
"I am fairly worried, as we are tired and that is because we have played more than anyone else this season," said Galliani. "We knew the trip to Japan would cost us. Just look at what we have done since January 13 - we have played something like 13 games in 40 days. It is verging on the impossible.
"We hope to find energy from somewhere to face difficult encounters like Tuesday's with Arsenal."