Massallah pertaining to Sajdah-e-Telawah

Assalaamu `Alaykum wa Rahmatullahi wa Barakaatuh.
Respected Mufti Saheb, what is the ruling concerning a person who, whilst
performing Salaah hears someone reciting a Sajdah Aayah? Should he perform
the necessary Sajdah immediately, or delay it until his Salaah is complete?
Jazaakallahu Khairan.