Lautaro Martinez broke the deadlock for Antonio Conte's side in the 27th minute.
However, Joao Pedro powered a header home from a whipped Nahitan Nandez cross to equalize for the home side in the 50th minute.
Stefano Sensi's free-kick rattled the bar for Inter on the hour mark and the midfielder then proved crucial in the winning goal as he was tripped by Fabio Pisacane to hand Romelu Lukaku the chance to convert from the penalty spot.
Read Full StoryImportant win tonight ?????????????? #ForzaInter #Team #CagliariInter @SerieA @Inter
— Kwadwo Asamoah (@Asabob20) September 1, 2019
Vittoria importante stasera ?????????????? #ForzaInter #Team #CagliariInter @SerieA @Inter pic.twitter.com/UWnqwZGPyY

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