"I will leave in January," the Egyptian defender told FilGoal.com in a phone call from France.
"I can't stay any longer (without playing)."
The international left-back featured only three times this season and was left out of his side's squad in the past seven games.
Abou-Mosallam has yet to know his next destination but said he will consider offers before deciding in January.
He didn't rule out staying with the Ligue 1 club should changes happen in the coaching staff before the New Year.
"I may stay only if manager Jean-Marc Furlan left before January," Abou-Mosallam said.
Strasbourg are tenth in the league on 23 points, with two games to go in the first half of the season.
Abou-Mosallam told FilGoal.com in August: "I've been overlooked since he took over as coach."
"He signed a 34-year-old French full back, whose knee injury kept him on the sidelines for a year. Yet, he prefers to start him."
The former Ahli player moved to Strasbourg two years ago and played a pivotal role in the club's promotion to the French top flight.
نرشح لكم
أرنولد: ما حدث في مباراة بنفيكا عار على كرة القدم
فالفيردي: ما حدث من عنصرية أمام بنفيكا مؤسف جدا
ريمونتادا مكتملة الأركان.. باريس سان جيرمان يُحبط مفاجأة موناكو في أبطال أوروبا
مع طرد مورينيو وتوقف للعنصرية.. لدغة فينيسيوس تقود ريال مدريد لهزيمة بنفيكا
سباليتي: عدنا ثلاث خطوات إلى الوراء أمام جالاتاسراي.. ولا فائدة من الكلام دون أفعال
مباشر أبطال أوروبا – بنفيكا ضد ريال مدريد
تشكيل ريال مدريد – مبابي وفينيسيوس يقودان هجوم ريال مدريد أمام بنفيكا
تقرير: جاكسون يقترب من العودة إلى تشيلسي











