His first European goal for Olympiakos came in a Champions League home win (3–1) against Borussia Dortmund.
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Djebbour started the season with a goal in a 2–1 away win against Veria after an assist of Holebas.
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He also scored in a home win 3–1 against Kavala after an assist of Giannis Maniatis and in the final match of the season, against AEL 1964 FC after an suberb assist of Albert Riera.
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On 6 September 2013, Djebbour joined Süper Lig club Sivasspor on a season-long loan after the interest of the coach of the club, Roberto Carlos.