By Siddhi Nayak, Sarita Chaganti Singh and Nikunj Ohri MUMBAI/NEW DELHI (Reuters) - Indian lenders, including State Bank of India, are reviewing their exposure to Adani Group and examining whether they need to tighten their due diligence when offering new loans to them,

SBI has the largest exposure to the Adani Group among Indian banks, with sanctioned loans of Rs 33,800 crore ($4 billion)

Bank of India, Union Bank, ICICI Bank, Canara Bank, IDBI Bank and RBL Bank, which have a relatively smaller exposure to the group, are also undertaking a similar exercise.