Patil is a whole-time director and Senior Executive Vice-President for L&T's Defence business, while Raman presently oversees the finance functions across the L&T Group.
The committee has also approved the appointment of Prasanna Rangacharya and Deepa Gopalan Wadhwa as independent directors, the filing added.
"Subroto Bagchi, who retires by rotation at the 20th AGM on July 16, 2019, has not offered himself for re-appointment," it noted.
At the end of March 2019, Mindtree had eight members on its board, including co-founders Rostow Ravanan (CEO-MD), Krishnakumar Natarajan (Chairman) and NS Parthasarathy (Executive Director).
It has four independent directors on its Board - Apurva Purohit, Milind Sawarte, Akshaya Bhargava and Bijou Kurien.
Emails sent to the company seeking details of the restructured Board post the latest appointments did not elicit any response.
Interestingly, in March, Bagchi had resigned as the head of Odisha's Skill Development Authority and made a comeback to Mindtree.
In March, L&T had said it will buy 20.32 per cent stake in Mindtree from V G Siddhartha and his coffee enterprise for over Rs 3,000 crore - marking India's first-ever hostile takeover bid in the IT space.
Since then, L&T has steadily increased its holding in the Bengaluru-based tech firm to about 30 per cent. It is currently in the process of an open offer to buy an additional 31 per cent stake. In all, the infrastructure major is eyeing about 66 per cent stake in Mindtree for over Rs 10,700 crore.
The open offer - with an offer price of Rs 980 per share - opened on June 17 and is slated to close on June 28. If the offer is subscribed fully, the engineering behemoth will end up with a 66.32 per cent holding in Mindtree.
Mindtree was also in the spotlight when its Board in mid-April proposed to pay a special dividend to shareholders, including promoters, that along with regular dividend and tax components would strip the mid-sized IT firm of about Rs 530 crore.
Mindtree's net profit grew 32.2 per cent to Rs 754.1 crore in 2018-19, while revenue was up 28.5 per cent to Rs 7,021.5 crore from the previous fiscal.