Kante knows his side must put their hopes of beating Eintracht Frankfurt to reach May's final in Baku to one side so they can concentrate on a top-four finish.
Kante said: “The final is a target for the club and us, and it's what we will try to do.
“We are three games away from the title but we need first to go for fourth and then do our best.
“Slavia was an important game for us, it was important to win and qualify and we did the job.
“We are happy with the win.
“The second half was a bit difficult. They scored two beautiful goals but, in the end, we went through and that's the most important thing.
“It was a good feeling to be three goals up so early but we knew they were a good team with good fighting spirit because it's what we felt away in the first game.
“They did very well in the second half and it was difficult but to score three goals in the first half was very good."