"Look who I had a big delicious Italian meal with last night! I'm honored to join @TonyDanza and the cast of The Good Cop, coming to @netflix in 2018," Groban tweeted Wednesday, along with a photo of Danza and him smiling.
Monk creator Andy Breckman serves as show-runner and executive producer of the 10-part series.
"Groban will play the role of Tony Jr., an earnest, obsessively honest NYPD detective who makes a point of always following the rules," a press release from the streaming service explained. "Tony Jr. is son to Tony Sr., a disgraced, former NYPD officer who never followed the rules."