Jamie Carragher claims Ruben Dias must be a success at Manchester City or manager Pep Guardiola could leave the club at the end of the season.
City are about the announce a deal for the Benfica centre-back on a £65million deal following their embarrassing defensive performance in the 5-2 defeat to Leicester City on Sunday.
And Sky Sports pundit Carragher believes Dias must fix Guardiola's leaky defence or City will not win the title, meaning the Spanish coach could abandon his project at the Etihad Stadium.
Speaking on Monday Night Football, the former Liverpool man said: 'If this signing doesn't work and he's not a huge success, I don't think City can win the league (and) I don't see Guardiola staying at the club next season - certainly if they don't win the league.