French supermarket major Carrefour SA CARR.PA said it was seeing price inflation in the low to mid-single digits, similar to the 3%-5% that its rivals have noted. The company's finance chief had said in October that Carrefour was "planning to be very aggressive" as it entered price negotiations, and that suppliers demands would be rejected. By Richa Naidu LONDON, Feb 17 (Reuters) - European retailers are locked in extended price negotiations with giant food companies - including the world's biggest, Nestle NESN.S - as they fight to retain shoppers and protect their profits.