However, Robinho, who scored a sensational goal at the Emirates Stadium this week to help Brazil to a 2-0 friendly victory over Italy, maintains that the Manchester City 'project' is still on track.
'Where do I see City in 10 years' time? A respected club, one that every player will want to play for,' said Ronbinho.
'Hopefully by then the club will have won many titles, such as the Premier League and Champions League.
'Our objective is to be big but we must work hard. We can be bigger by winning titles.
'The owners have been buying excellent players. I don't know anything about their business but they are showing they understand football.
'They are investing in the team, which I believe will bring good results. I think City has excellent players.'
Another Manchester City player, Elano, also impressed against the World Cup winners, scoring the game's other goal, and admitted he was disappointed when Kaka chose to stay in Italy rather than coming to the Premier League.
'Yes, I was sad he didn't come. To have played next to him at City would have made a difference because he brings a lot of positive things,' said Elano.
'He's a world-class player and very well-regarded. I would have loved him to play for City. But it was his choice whether to come or not.'
City manager Mark Hughes fined Elano around £50,000 earlier in the season after the Brazilian spoke of his displeasure at starting many of the club's matches on the bench, but the player claims that there has been no lasting damage to his relationship with the Welshman.
'It's all OK. I don't want to cause a problem,' he said. 'I only feel upset because I feel I'm capable of starting every game. I am working hard.'