Bayern Munich boss Hansi Flick admitted on Friday that he is unsure whether his players are match fit ahead of the Bundesliga restart this weekend.
Defending champions Bayern hold a four-point lead ahead of Sunday's game at Union Berlin, as German football returns behind closed doors following a two-month suspension due to the coronavirus pandemic.
Bayern, like Germany's other clubs, only received the go-ahead to resume full team training last week.
"We don't know if the team can hold out over 90 minutes," said Flick.
"We have trained well and played three matches of 20 minutes each last Sunday.
"They were played at a very high intensity, but we don't know clearly where we stand.
"We have to just deal with the situation."
"We will use it to replace a tired player. In the weeks with a lot of games it's great."
"If we manage to ensure that the season continues, it will send a signal to all leagues."
"If a player had doubts, he could have decided not to play -- without consequences. But they are all in, except for those who are injured."