The Qatar forward already missed Friday's session before his lawyer and spokesman Hesham Hassan confirmed why the 28-year-old went AWOL.
But Yasser's disappearance caused Zamalek to be in a state of disarray that does not seem to be leading to any agreement between both parties.
Football director Ibrahim Hassan stressed that Yasser's decision to boycott training will only result in 'severe punishment'.
"Yasser will be handed severe punishment for missing training without prior notice," Hassan told FilGoal.com.
"This is not a professional way to sort things out, it just indicates that he doesn't respect the team.
"He needs to learn that he can't force us to do anything."
Hesham said his client wants to earn EGP 2.5 million at Zamalek, which is the same worth of his contract with former club Ahli.
Yasser had landed himself in hot water earlier this season when he did not report back from international duty on time.
He later rejected a contract extension from Zamalek, to raise doubts over his commitment to the Whites.
نرشح لكم
هشام نصر: الزمالك سيحصل على رخصة المشاركة الإفريقية خلال أيام
الزمالك يكشف عن راعي جديد للقميص ويطلق مشروع التحول الرقمي
في الجول يكشف تفاصيل مفاوضات الأهلي لضم علي محمود من إنبي
المصري الثاني.. محمد هيثم ينضم إلى راسينج سانتاندير الإسباني
خبر في الجول - إنبي يوافق على إعارة أحمد زكي لـ الجونة
الشرق الأوسط: الرياض السعودي يتوصل لاتفاق مع الأهلي لشراء تريزيجيه
خبر في الجول - عبد الواحد السيد يتولى منصب مدير الكرة في نادي مسار
خبر في الجول - معتمد جمال في مفاوضات متقدمة مع الشرطة العراقي.. وموقفه من الزمالك











