Bayern Munich boss Pep Guardiola is unsure what to expect when his side face CSKA Moscow behind closed doors on Tuesday.
The German champions will meet their Russian counterparts in the UEFA Champions League in an empty Arena Khimki.
No supporters will be in attendance as CSKA were sanctioned by UEFA in February after fans displayed "a range of racist and far-right symbols" in a Champions League match with Viktoria Plzen last December.
Looking for their second win from two matches in Group E following a 1-0 success over APOEL last time out, Guardiola concedes it is an unfamiliar scenario for him.
"I've never experienced it," he said. "We'll have to be wary of the situation.
"We have a big opportunity - we can take a small, but good step forward."
Bayern had the better of CSKA when the pair met in the group stages last season, winning 3-0 at home before a 3-1 success in Russia, but Guardiola warned against any complacency on his team's part.
"Do last year"s victories against CSKA give us more confidence? This is a normal situation, but we know CSKA well enough," he said.
"They have a good coach and have almost the same players who were with them last season. The club needs to be respected no matter what, even despite their result [a 5-1 defeat] in Rome.
"They have experienced players like [Sergei] Ignashevich and [Igor] Akinfeev and some very quick players in attack. This is a very difficult opponent and we will respect them fully.
"At present all our players are fit. We have our last training session today and after that we will look into this question, but as I understand everyone is healthy.
"In the UEFA Champions League, you need to remember that this is a very high level. We need to make sure that we get out of the group as it is very tough."