MILAN, Aug 30 (Reuters) - Andriy Shevchenko has rejected former coach Jose Mourinho's assertion that he failed at Chelsea because he was too used to being treated like a prince at AC Milan. The Ukraine striker has just returned to Milan, where he spent seven successful seasons, after struggling for form during two torrid years in London. Mourinho, now Inter Milan coach, was in charge of Chelsea when they signed Shevchenko in 2006 for a club record fee of around 30 million pounds. 'It's been said that I was treated like a prince, but that is not how it was,' Shevchenko told a news conference on Saturday. 'Here I had difficult moments as well, which I overcame with work and sacrifice. Now I'm very optimistic because returning to Milan is like returning home.' Shevchenko also compared the Chelsea set-up unfavourably with Milan's. 'When I was at Chelsea what I missed most was the organization, the preparation and the atmosphere of this club, lots of little things that are nevertheless important,' the 31-year-old said. Swiss defender Philippe Senderos also said he was confident he had moved on to better things after his transfer from Arsenal this week. 'Arsenal are a great team, but Milan are the greatest in the world,' Senderos was quoted as saying by Milan's website. 'I've seen that players work more here in the Italian championship than in the English championship.'