The Brazilian has transformed Inter's fortunes since succeeding Rafa Benitez.
"Thanks to the work of an intelligent Coach like Leo, I am sure the team can grow even more," said the captain on Sky Sport Italia.
"On top of that, we no longer have 12 injured players like we did in November, as that really penalised us in the League.
"There's still a long way to go and there are another 10 games from here to the end of the season. We will fight to the bitter end for this objective."