The Old Lady's ultras, Curva Scirea, didn't attend their team's 2-1 win over Atalanta in protest against their string of poor results this season.
After Sunday's game, some of the ardent fans showed up to hurl eggs and insults on the players and their bus.
One of the ultras even slapped French center back Jonathan Zebina, who has been panned of late, on the back of the head.
Bettega admitted that Juventus are not anywhere near their best, but highlighted the circumstances that resulted in their unpleasant status.
"We all know that we are not having a great season and even this victory cannot hide the problems," he said.
"Now we want to try and get our fans back as well as our fitness and the injured players.
"We had many absentees against Atalanta, but it's not right to throw this into the mix and diminish the work done by those who played.
"Now we'll also have a way of working with more tranquility as we don't have any more midweek commitments."
Juventus lie sixth in the Serie A table with 48 points, having slumped to 11 defeats this term.
Juventus' ultras gathering
نرشح لكم
تقرير: صراع بين يوفنتوس ونابولي على ضم فاريلا هداف الدوري
دوري الأمم - الإصابة تحرم إيطاليا من خدمات فراتيسي قبل مواجهة بلجيكا
دورجو يغادر معسكر الدنمارك للإصابة
هاري كين: عشت أسابيع جنونية.. وكنت محظوظا بما يكفي
مالكوم يكشف كواليس تدخل ميسي لإبقائه في برشلونة
تقرير: الركراكي يقترب من العودة للتدريب عبر بوابة لانس
أوباميكانو يغادر معسكر فرنسا
بوكيتينو: رحيلي عن أمريكا من أصعب قرارات مسيرتي










الظهور الأول لـ علي ماهر.. مصر تمطر شباك مالاوي بخماسية وصلاح يعادل رقم حسام حسن
خبر في الجول – بالأرقام.. الزمالك يسدد جزءا من صفقتي أحمد شريف وعمرو ناصر لـ فاركو