The Dutch tactician took over at Chelsea earlier this month following the sacking of Luiz Felipe Scolari.
The Blues defeated Aston Villa 1-0 in the Premiership and beat Juventus by the same scoreline in the Champions League in Hiddink’s first two matches at the helm.
"There is a difference in the players," England left-back Cole was quoted as saying by Sky Sports on Friday.
"When a manager goes it is always hard and the players liked him (Scolari), but now it is a fresh start for a lot of players and I think there is a different kind of belief."
Hiddink was widely appreciated by Chelsea fans for playing strike duo Didier Drogba and Nicolas Anelka together.
Anelka was Scolari's preferred choice upfront as Drogba played a peripheral role. The Ivorian striker was reportedly seeking to leave Chelsea as a result of his substitute role.
But under Hiddink, Drogba got a new lease of life and scored the winner in Chelsea's midweek victory over Juventus in the first-leg of the Champions League round of 16.
نرشح لكم
مؤتمر سلوت: نتوقع من صلاح وجاكبو استغلال الفرص المحققة
جاريث بيل يوضح الفارق بين أنشيلوتي وزيدان
تقرير: قطر تتمسك باستضافة مباراة إسبانيا والأرجنتين
رقم سلبي يتكرر بعد 51 عاما.. توتنام يسقط أمام كريستال بالاس بثلاثية ويقترب من الهبوط
لابورتا: لا تعاقدات جديدة في الصيف إلا إذا وجدنا اللاعب المناسب
طبيب مبابي: إصابته غير مقلقة.. وسيعود للمشاركة قريبا
ذا أثليتك: المنافسة خارج الملعب.. نونو سانتو يقاضي نوتنجهام فورست












أنس أسامة مستمر مع الاتحاد حتى 2029