Kaka made his latest comeback for Milan as a second-half substitute and Ancelotti said: "We need to speed up the moves going forward and for this Kaka's movement is crucial. We hope with the break for international duty he can get back into shape.
"He is still struggling, but he is improving and still a little sensitive with that bruised foot, so he can't move as he usually does.
"I think our first half at Siena was worse than the way we played today, but then we got a 2-0 lead and it all became easier on the counter. Unfortunately with the way this match panned out, we didn't get those opportunities."
Ancelotti seemed irritable during the game and kicked a loose ball away in anger, but laughed the incident off.
"The ball was too lovely not to volley it! I risked a thigh strain, though!"