Bologna Coach Alberto Malesani believes Leonardo is destined for greatness at Inter.
The Brazilian was appointed in December to replace Rafa Benitez.
He has won his first three games in charge of the Nerazzurri.
Speaking ahead of tomorrow's game between the two sides, Malesani said: "He is special, one of those coaches who doesn't need to come up through the ranks.
"Everyone speaks well of him. If Milan and Inter have appointed Leonardo it means that he is mature.
"Inter will be very motivated. If everything goes perfectly for them, there will be no story.
"The indications say that it shouldn't even be a game. But we must try and ensure that Inter aren't perfect and then there could be a surprise," he concluded.