Inter Milan's motivation is much greater after defeating Bayern Munich and now they can focus more on preparing themselves when facing Cagliari. This is indeed not a difficult match because Cagliari is not a tough opponent, but Inter Milan also needs to be aware because losing points can cause Napoli to be slightly more advantaged because they will have a one-point difference.
Cagliari is only in 15th place in the standings and they have not performed consistently in the previous matches so it is much easier for Inter Milan to beat them. But even so, Inter Milan must be a little more careful because a draw will not benefit them in their pursuit of the Serie-A trophy.
Inter should beat Cagliari, even though they have a very difficult return match in the Champions League with Bayern, they also need to think about not letting Napoli get any closer to them. Especially since they have drawn with Milan and Parma twice in a row and they were lucky that Napoli also lost points, but this will not continue forever, so Inter should beat Cagliari at home. Napoli will most likely beat Empoli at home, and Inzaghi would not want them to be tied on points.