Chelsea manager Jose Mourinho has continued his criticism of Manchester City ahead of tonight's Premier League showdown by saying their opponents should have won more silverware.             

Having already claimed that City have enjoyed the rub of the green from referees in recent weeks and taken aim at the financial backing received from the club's Abu Dhabi owners, the Portuguese said they have not won enough since Sheikh Mansour took over the club in 2008.             

They won the FA Cup in 2011 and the Premier League the following season, but the current Champions League campaign is the first they have progressed past the group stage.             

"They won one title, won a couple of cups," Mourinho, in his second spell at the west London club, said.             

"Only in Europe they didn't do well, or close to doing well. Speaking objectively, they did very bad in the Champions League in previous seasons, also in the Europa League.

"But the team is fantastic, the squad is fantastic and normally they (should) win more titles."             

City, currently second on 53 points, can move ahead of Arsenal at the top of the table with victory at the Etihad Stadium, while a win for the Blues will put the top three teams within two points of each other.  

Manuel Pellegrini's side have scored 72 goals in 18 home matches this season, but Mourinho insisted they were capable of scoring regularly as well, despite being unable to break through some resolute West Ham United defending on Wednesday.

Argentinian striker Sergio Aguero will miss the next month with a hamstring injury and City will also be without Samir Nasri (knee) and Javi Garcia tonight.

For Chelsea, Fernando Torres is out with a knee injury while there are doubts over new signing Mohamed Salah's match fitness.

Mourinho also stated that he believes it will be "impossible" for clubs to compete with Manchester City if Financial Fair Play is not enforced.

City's vast spending in an era of Financial Fair Play has come in for repeated veiled criticism from the Portuguese, who is keen to see how the economic regulations are explained and enforced by European football's governing body UEFA.

"If they (football's authorities) want to make it impossible (to compete with City), it's impossible," Mourinho said.

"(Chelsea) are not competing outside what is important for us, the 'fair' Financial Fair Play.

"We are working, thinking and believing that Financial Fair Play is going to be in practice.

"So there are things that are impossible for us (to do)."

When Mourinho first worked in England he admits "it was a free world".

He added: "There was no Financial Fair Play. If your club was a rich one, your owner a rich one, there were no rules. It was an open situation."

"There was no Financial Fair Play. If your club was a rich one, your owner a rich one, there were no rules. It was an open situation." - Jose Mourinho

It meant Chelsea were unpopular. City, however, are playing a brand of football so scintillating and scoring so freely that they are attracting admirers.

Mourinho said: "In my time we were accused of buying the title, no? Because our owner was Mr Abramovich, just arrived in the country. Maybe now people see City in a different way.

"Times change. Maybe 10 years ago a huge investment in the club was something that people hated and in this moment it's something people accept in a different way.

"Probably, if UEFA goes with Financial Fair Play until the last consequence and they explain really to the people what Financial Fair Play means, maybe in that moment people will realise that some teams are different to other teams.

"But it's something I don't think about at this moment."

Mourinho has long described City, who were beaten 2-1 at Stamford Bridge in October, as favourites for the title and he has claimed Chelsea finishing second in the Premier League this season would be an achievement.

"If we finish second it's fantastic," he said. "If we finish second doing the formation work, it's an acceleration of our process. If we finish second it's good."