The Blues are at the King Power tonight to face Nigel Pearson's in-form side.
The Foxes have won four on the bounce and are aiming to delay Chelsea's title surge.
The Blues require just five points to be crowned champions - and could clinch the title as early as the weekend when they face Crystal Palace.
But they need to win tonight and the Serbia defender admits they need to stay focussed.
He said: "This is a very important game for us but we know how difficult it is going to be.
"We are close but we have to stay focused up to the last game."