LONDON, Dec 7 (Reuters) - Mike Ashley’s Frasers Group said it is in negotiations to buy collapsed British department store chain Debenhams from administrators in a potential rescue deal. Frasers said that it hoped a deal, previously reported by The Sunday Times, could be reached and jobs saved, but cautioned that the transaction was complicated by the recent administration of Debenhams-concession holder Arcadia Group. “There is no certainty that any transaction will take place, particularly if discussions cannot be concluded swiftly,” Frasers said in a statement on Monday.