Having lost their opening four games of the season under Pako Ayestaran, caretaker Voro has steadied the ship with successive wins over newly promoted duo Alaves and Leganes.
Voro backed Prandelli's arrival when discussing the Italian's potential arrival before confirmation came.
He said in his pre-match news conference: "Prandelli is a fine coach who has worked at the highest level and led his national team.
"I do not know him personally, but he is a great coach."