Just saw this on his Wikipedia site:
At January transfer window Rafik Djebbour renew his contract with Olympiacos until 2016 and make the following statement: "After what happened the last few days on my own initiative, I met with the president of Olympiakos, Mr. Marinakis told him of my intention to stay in the team, because the money was never my priority and agreed to be here for the next three years.I want all of the Olympic family to know that he never wanted to leave from Piraeus and would do anything to be our fans happy and to celebrate with me and my teammates victories and titles ..." .
2016 according to this too:
http://www.transfermarkt.co.uk/en/rafik-djebbour/profil/spieler_20903.html