Lord Narasimha Temple Near Malayappa Temple:
Devotees who visit Tirumala Sri Venkateshwara Temple can witness and worship Lord Yoga Narasimha (three feets idol), at the north-eastern corner of the first Prakaara Mandapam facing west, inbetween the Vimana Pradhakshina (circling) path of the Sanctum Sanctorum.
Lord Yoga Nrusimha idol was actually chaired at the west side of the Swami Pushkarini (Lords Sacred Pond) that was not worshipped till the transplantation was done by Sri Ramanuja Acharya.
Since Lord Nrusimha and his Manthras are considered most important and auspicious to Vaishnavas, hence Sri Ramanujacharya who in order to praise the Alwar Sthothrams has done the modification.
After some years a small shrine was built and laid some path around shrine for Pradhakshina (circumnavigate) the lord.
Yoga Narasimha Swami is also called as Girija Narasimhaswami.
The worship pattern followed to Lord Nrusimha during the period of Sri Ramanuja was unknown but Abhishekam and poojas on every Fridays, ceremonial bath (Thiru-Manjanam) is given to the idol on every Saturday and and special uthsavs will be held on the fourteenth day of the bright half (Purnima thithi) of the Vaisakha month (lunar calendar month) on account of Narasimha Jayanti.
Sri Ramanuja Acharya not only done this modification but was the person to provide a systematic and streamlined the rituals at Tirumala Sri Venkateshwara Temple which is still followed now.
He restructured the vimana and installed idols according to the Agama traditions. He appointed the hereditary Vaishnava priests belonging to the Vaikhanasa agamas and he also introduced the recitation of Naalaayira Divya Prabhandams. He had set up the Jeeyar Mutt to supervise the temple rituals as ordained by Ramanuja which is still in their control only.
References about Lord Yoga Nrusimha that dates back to C.E. 1469, is found in the Inscriptions belongs to Kandhadai Ramanuja Ayyangaar.