Manchester City defender Ruben Dias is ruled out for up to a month as he set to miss crucial games against Chelsea and Man Utd

As defender Ruben Dias is sidelined for up to a month due to injury, Manchester City suffers a major setback.

Ruben Dias's injury, which might keep him out for up to a month, was a setback for Manchester City.

Dias continued to play throughout the competition despite having a thigh issue as Portugal defeated Switzerland in the last-16, according to information obtained by Sportsmail.

The center defender hasn't participated in City training since his return from Qatar, but four days later, when Portugal fell to Morocco, he played the complete 90 minutes on the pitch.

Following the team's 3-2 Carabao Cup triumph against Liverpool, initial predictions predicted that Dias, one of City's five captains, would be out for the team's next five contests.

The 25-year-old is expected to miss the Chelsea doubleheader and the Manchester derby because of his time off.

'Ruben is injured. Kalvin Phillips is not fit, he did not arrive in the best condition to play,' Guardiola said.

The 25-year-old will miss the derby against Manchester United and the doubleheader against Chelsea on January 14 because of his vacation. Before traveling to Old Trafford, Dias must show that he is physically fit.

Kyle Walker's return to fitness has eased City's defense's injury problems, which has eliminated the necessity for center halves to play right back, much to Pep Guardiola's displeasure.

Since his return from international service, Kalvin Phillips has been missing from both training and the Etihad Stadium.

Since signing with Leeds for £42 million The central midfielder, who joined in the middle of the season, has only recently arrived and has only played for around an hour.

Pep Guardiola is worried about Kyle Walker's absence, despite the fact that his return to fitness has helped City's defensive injury problems.