A question about Muslims performing some prayers in club dressing rooms which are mostly connected to toilets and showers was addressed by Dr. `Abdel-Fattah Idrees, professor of Comparative Jurisprudence at Al-Azhar University, and he stated:
“Abu Dharr (may Allah be pleased with him) is reported to have said to the Prophet (peace and blessings be upon him): ‘O Allah’s Messenger! Which mosque was built first?’ He replied, ‘Al-Masjid Al-Haram.’ I asked, ‘Which (was built) next?’ He replied, ‘Al-Masjid Al-Aqsa (i.e. Jerusalem).’ I asked, ‘What was the period in between them?’ He replied, ‘Forty (years).’ He then added, “Wherever the time for the prayer comes upon you, perform the prayer, for all the earth is a place of worship for you.” (Reported by Al-Bukhari)
Performing prayer in a clean place is one of the conditions for the validity of one’s prayer. This denotes that the Muslim is allowed to perform prayers at any place, as long as it’s clean, irrespective of whether that place is a Mosque or anywhere else.
On the basis of the above-mentioned condition, we conclude that there is nothing wrong, as far as Islam is concerned, to perform prayer in the place like club dressing rooms whether non-Muslims are accustomed to entering such places or not.”
May Allah guide you to the straight path and direct you to that which pleases Him, Amen.