The Black Cats suffered their second successive loss in the Premier League this season, when they went down 3-1 to the newly-promoted outfit at the Stadium of Light.
Norwich went 3-0 up by the hour mark, thanks to goals from Russell Martin, Steven Whittaker and Nathan Redmond, with Duncan Watmore pulling one back for Dick Advocaat’s side on 88 minutes.
Former Sunderland star Gray was following the match, and he was not pleased with what he saw.
The 41-year-old predicted a tough season for the Black Cats, and so did former West Ham United and Queens Park Rangers defender Danny Gabbidon.
Looks like it's gonna be a long season again for the black cats. Not a good start.— Daniel Gabbidon (@Gabbidon35) August 15, 2015
Sunderland lost their opening game of the Premier League season 4-2 against Leicester City away from home at the King Power Stadium last weekend.