Performing Sajdah Tilaawah before the Sajdah Tilaawah verse

Q: Salaah-669: A Haafidh sahib performed the sajdah Tilaawah before even reciting the Sajdah Titaawah verse. Will this affect the salaah in any way?

Answer: Yes, it will be affected and Saldah Sahw will be necessary to compensate. And Allaah knows best what is most correct.

Fatawa Rahimiyyah vol.2