"The formal letter of appointment has been issued and it is up to him (Bhattacharya) when he can take charge. We will have more clarity on the date of his joining Dec 26," a CIl official said. The Public Enterprises Selection Board in November recommended the name of Bhattacharya, a 1985 batch Indian Administrative Service officer, for the post of chairman and MD of CIl after considering a total of 12 contenders for the post.