I didn't hear any motivation from Lecce before their game, they were only cautious and hoping for a result. Cagliari on the other hand want to either stop our unbeaten run or prevent us from winning to make a favour for Milan, they already said it as it is.
I bet there are Juve fans among the Cagliari players and I guess they won't be too thrilled to gift the scudetto to Milan now that Cagliari really doesn't have anything to play for. On the other hand, there are probably some Milan fans in that team too. The other Cagliari players are probably indifferent to the scudetto race and one can't predict how will they play today.