Real Madrid GM Jorge Valdano was delighted seeing Kaka get on the scoresheet in victory over Villarreal.
Kaka found the net in only his second game back from long-term injury.
Valdano said: "He looks much more optimistic. He's a special player and we have high hopes for him.
"With him, we will make a leap in class, there is no team in the world with a booster in January of this category.
"We have to be happy he is with us."