The alleged assault reportedly took place at around 10.40pm on Saturday, October 10.
Police said they have been making a number of enquiries in relation to the incident.
But today (February 2) officers released a CCTV image of a man they would like to speak to as he was allegedly in the area at the time.
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"We are still trying to establish exactly what happened and the man pictured could hold vital information," a spokesman for Lancashire Police said.
"If this is you, please come forward and speak to us."
If you know who the man may be, or you have any information about the incident, call police on 101 quoting incident reference number 1749 of October 10, 2020.
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