designing a circuit where I have to use an Op-Amp for conditioning signal from a Current Transformer

DO remember, that while this works quite well, if you need e.g. A/D precision much beyond 8 bits, it may not be a good solution. Also, select a low power op-amp.

I have never tried it for higher precision, it may very well work, but do a test setup using an op-amp with a good power supply rejection ratio and let us hear the result.

Erik