The 65-year-old takes over with winless Verona anchoring Serie A.
Sunday's latest 3-2 loss to Frosinone left them with a mere six points out of a possible total of 42.
A former coach with Porto, Roma and Juventus Del Neri, out of work since 2013, said: "I thank the club for their confidence in me.
"I missed football. I'm joining a club rich in passion and tradition."