However, the agreement will not immediately affect ratings for Tata Steel and Tata Steel UK Holdings, based on the information so far on the amount of liabilities and debt to be transferred, Moody's said in a note.
"The sale of the long products business amid a challenging economic environment is credit positive, although a timely and seamless divestment of the UK business is a key rating sensitivity," it said.
"Even though the sale is for a nominal consideration, it is credit positive for Tata Steel UK Holdings because it would dispose a part of TSUK Holdings' loss-making operations, and reduce the drag on the company's profitability," it said.
Tata Steel's European business reported EBITDA losses for the nine months ending December 2015.
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Tata Steel this month announced its intention to restructure/divest its entire UK business.
With the sale of the long products business to Greybull, the balance of its UK business comprises primarily of its operations at Port Talbot, which manufacture slabs, hot rolled coils, cold rolled coils and galvanized coils.
It would also depend on a reduction in operating expenses following the divestment, one-off restructuring expenses, if any, any additional pension-related costs to be incurred by TSUK Holdings, TSUK Holdings' pro forma debt/capital structure and an improvement in TSUK Holdings' financial leverage.