![Soccer Football - Champions League - Chelsea Training - Cobham Training Centre, London, Britain - October 30, 2017 Chelsea's Willian during training Action Images via Reuters/John Sibley](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/MNIED6MVDMUKUXKM6HPCBYFTUQ.jpg?smart=true&auth=714389bb81458750cee082b55df334b945cb7edc678729e348625cc0cee0b38c&width=400&height=225)
Willian, centre, believes Manchester City's form will make it hard for Chelsea to win the Premier League title. John Sibley / Reuters
Willian, centre, believes Manchester City's form will make it hard for Chelsea to win the Premier League title. John Sibley / Reuters
Chelsea face 'difficult' title defence due to Man City form but 'we will fight till the end', insists Willian
Premier League leaders have won 10 and drawn one of their opening 11 games and lead the current holders by nine points.