Francesco Guidolin said referee Neil Swarbrick's decision to award Man City a penalty was the turning point in Swansea's 3-1 defeat.
Tony Cottee and Tony Cascarino grade each Premier League side after the weekend, with Chelsea and West Ham failing badly.
Sergio Aguero's double helped Man City maintain their 100 per cent start to the Premier League season with a 3-1 win at Swansea.
Watch every goal from the weekend's Premier League games, including wins for Man City, Arsenal, Man Utd and Southampton
All the latest news and rumours with Wayne Rooney reportedly ready to see out his remaining two-year deal at Manchester United.
Dermot Gallagher explains the weekend's big decisions, including why West Ham were correctly denied three penalties.
Sergio Aguero scored twice as Man City won at Swansea. Review the action and see highlights here from 5.15pm.
Manchester United legend Bryan Robson believes Ryan Giggs would succeed if given the chance to manage a club like Swansea.
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