WARSAW, Oct 31 (Reuters) - The management board of Polish state-controlled lender Pekao has approved a eurobond issue program that would allow the bank to sell up to 5 billion euros in medium-term notes, the bank said on Tuesday.

The bonds could be issued in euros or zlotys or other currencies in several tranches of different duration and interest structure, the bank said.

A potential sale of a series of the bonds would require a separate resolution of the bank's management board, Pekao said. (Reporting by Marek Strzelecki Editing by Chris Reese)