The 42-year-old replaces Felipe Conceicao, who was sacked on Saturday after just seven matches in charge, reports Xinhua news agency.
"I'm aware of the size of the club and the passion of the fans.
I'm ready to work together to repay the faith shown in me."
Valentim has just one year of experience as a first-team coach. He was appointed manager of Serie D club Red Bull Brasil in early 2017 before taking over as interim coach of Brazilian Serie A side Palmeiras in October.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)