MOSCOW (Dow Jones)--OAO Sberbank (SBER.RS), Russia's biggest bank, said it won't be among the bidders for Allied Irish Bank PLC's (AIB) 70.5% stake in Poland's Bank Zachodni WBK SA (BZW.WA). "Sberbank has taken the decision not to participate in the tender for acquiring Bank Zachodni WBK," a spokeswoman said by email late Thursday. State-controlled PKO Bank Polski (PKO.WA) and Bank Pekao SA (PEO.WA), a unit of Unicredit SpA (UCG.MI), may be bidding for the competing Polish bank, according to people familiar with the negotiations, as well as HSBC PLC (HBC), Italy's Intesa Sanpaolo SpA (ISP.MI), France's BNP Paribas SA (BNP.FR) and U.S.-based private equity company Apax Partners. -By William Mauldin, Dow Jones Newswires; +7 495 232-9192, [email protected] (END) Dow Jones Newswires July 02, 2010 04:15 ET (08:15 GMT)