Bhoys manager Neil Lennon recently admitted that he was keen on the 27-year-old, but revealed that he had yet to submit an offer.
"Celtic is a club with a great name," Salihi told the Austrian newspaper Kurier. "This could be a good step for my career.
"But I know nothing concrete. The deal would have to be right for all parties, including Rapid."
Salihi is an Albanian international.