As per bank's internal assessment, there may be an opportunity to buy additional portfolio in the range of Rs 20,000 to Rs 30,000 crore," SBI said in a statement. The country's largest lender said that it has stepped up target purchase of good quality portfolio of assets from NBFCs. NBFC stocks have wilted due to heavy selling pressure following the IL&FS defaults since late September as investors raised concerns over the rising cost of borrowing for them amidst IL&FS crisis. "There is a good opportunity to expand its loan portfolio at attractive rates.