European institutions voiced “serious concerns” about Greece'sability to repay its debt as Prime Minister Alexis Tsipras preparedfor a renewed showdown with party rebels in parliament to try topass a third bailout.

Greece's obligations will peak at 201 percent of gross domesticproduct next year, before dropping to 160 percent in 2022 under anew rescue program, according to European institution projectionsin a document obtained by Bloomberg. That exceeds the 120 percentlevel sought in the past by the International Monetary Fund (IMF)before putting its own money on the line.

Greek lawmakers are expected to vote on legislation by Fridaymorning that's required to unlock as much as 86 billion euros (US$96 billion) ofaid before a 3.2 billion-euro payment comes due to the EuropeanCentral Bank (ECB) on Aug. 20. The parliamentary action isnecessary to assuage Greece's lenders and would pave the way foreuro-area finance ministers, who meet in Brussels on Friday, tocome to a political agreement on the rescue package.