​Manchester United manager Jose Mourinho has claimed that the Premier League is the hardest league to win and it has become even more harder, given the financial strength of the teams.

The Portuguese manager, who has won three Premier League titles with Chelsea, is now looking to win the title with the Red Devils after leading them to a superb start to the season.

According to ​FourFourTwo, Mourinho said, "I think it is more difficult now. The economic power belongs to everyone."

"When you speak about economic power, it is not just to buy but to keep players and say, 'No, we don't sell'. That power belongs to every club in the Premier League, so the teams are potentially strong."

Mourinho has won league titles in Spain, Italy and Portugal but claims England's top flight is the toughest to win.

"But it was always difficult for different reasons. It is difficult because this is the country with more teams that fight for the title."

"And with more teams outside that group of six or seven who have conditions to give you hard matches and to take points off you. It is difficult because it is competitive. It is the most difficult country in which to win the title," he added.

United showcased their financial muscle by spending £75 million for Romelu Lukaku but Mourinho has now played down his influence in signing the Belgian striker who has started the season in great form.

"I don't think it was my influence, no. I think that we paid the money that Everton asked for and we paid the player the wages that his agent asked for and we paid the agents the commission that they asked for. I don't see another reason."

Mourinho and the Red Devils next take on Everton at Old Trafford tonight and another victory would solidify their status as one of the favorites for the title.