Eleftheropoulos has been told he needs an operation to cure the problem and faces up to eight weeks on the sidelines. The 26-year-old was already carrying a shoulder injury which he sustained during the recent derby match against Panathinaikos FC.
Theofanis Katergiannakis, who replaced him as a substitute against Panathinaikos and has kept goal in the last three games, will continue to deputise. Reigning champions Olympiakos are currently second in the Alpha Ethniki, two points behind leaders Panathinaikos FC following their 3-2 defeat by the Greens on 12 January.
©UEFA.com 1998-2015. All rights reserved.