Dietmar Hamann insists the "jury is still out" on whether Manchester City can compete with Europe's elite club sides and believes David Moyes' days at Manchester United could be numbered.
The former City midfielder believes Manuel Pellegrini's men will win the Premier League this season - City are currently lead Arsenal by a point at the summit of the table - but he reiterated his doubts over their potential to take on the likes of Barcelona, Real Madrid and Bayern Munich in the Champions League.
The 40-year-old was hit with a deluge of criticism by City fans after questioning Yaya Toure's role in the team. While insisting there are no doubts about Toure's talent, Hamann sticks by his comments.
"Every time he scores I get the brunt on Twitter. What I said was going forward we know what a talent he is - he is an outstanding player and one of the best players in the Premier League," he told Soccer AM.
"But I think defensively when they come up against Barcelona the jury is still out whether they have the capabilities, if they play with Fernandinho and Toure in the middle, whether they are defensively solid enough.
"The benchmark for City these days should be [Real] Madrid, [Bayern] Munich, Barcelona and not West Ham and Swansea. So the biggest tests for City are yet to come."
Misery for Moyes
Hamann was similarly cutting in his comments on City's rivals. He believes that Moyes' spell at Old Trafford could come to an end if United fail to secure Champions League football for next season.
"The next few months will tell, but I doubt it," Hamann said. "If they don't finish in the top four, which is a very good chance with the way the table stands at the moment, then the club have to make a decision.
"The next few months will tell. He has an opportunity with Juan Mata and Robin van Persie and Wayne Rooney coming back. I think it will be tough."
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