بسم الله الرحمن الرحيم
In the above mentioned case when you would complete your missed rakah after imam turns for salam then you will have to recite Surah Fatiha and any other surah along, it shall not suffice if you only recite Surah Fatiha.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.