The idol of Lord Krishna is seen in the navanitha nritya (celestial dance) pose of a child.
There are no records on the exact date when the idol was consecrated but the earliest record indicate that the idol was offered naivedyam (food offerings) in 1100 A.D. on occasion of Krishna Jayanthi.
[1] The idol of Sri Krishna does not receive main attention in the daily prayers of the temple.
During the annual Koil Alwar Thirumanjanam (cleansing of the temple), the idols are removed from the garbha griha (sanctum sanctorum) and replaced after the place is cleaned and consecrated with holy spices.
[3] The Krishna idol receives direct offerings outside the garbha griha on various occasions.