Joined Job With Fake Certificates

Dear Friends
I am suspecting one person joined a company with fake certificates of MBA. He is working in the company (I do not know the company name) with that fake certificate. What legal action can be taken against him if it is proved.

Dear Ananth,
With the fake certificates or otherwise, he has joined some company. It was duty of that company to check the validity and veracity of the certificate. They might not have done this check and if done, the fakeness of the certificate has escaped from their attention.
Nevertheless, you are the third party in the entire affair. Why you would like to inform the company? Do you bear grudge against that person? If not, then I recommend you leaving the matter to the fate of that individual as well as that company. After all, no fakery lasts forever and on one fine day the cat could come out of the bag.
Thanks,
Dinesh Divekar