It believes that there had been "little progress" in structural reforms.
Japan recently de-valued yen for economic growth.
Many including IMP oppose allowing industrial houses to set up banks.
The warning late on Wednesday came as a surprise given Tata shares hit a record high earlier this month on a rally sparked by expectations for improving sales at JLR, especially in the key China market, and optimism about the launch of new models.
It said that the company encourages "chronic under-performers" to leave as part of its staff management.
The software services provider looks to cut costs and boost sales.