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Benfica star Pablo Aimar has claimed that this is the worst Chelsea team there has been in the Roman Abramovich era.

Aimar also believes that the Chelsea players do not like ­interim boss Rafa Benitez – ­giving Benfica the upper hand for Wednesday night’s Europa League final.

The Blues won last ­season’s Champions League, but Argentine midfielder Aimar says times have changed.

“Of course, Chelsea are a big club, but this is not the same team that won the Champions League a year ago,” said the 33-year-old. “This team got knocked out at the group stages. They have not been ­convincing in ­Europe or in the Premier League.

“Since they have inherited a wealthy owner, this is probably the weakest Chelsea team there has been.

“And it is a team that is not behind the coach. We can take advantage of the fact they are not at their best and not playing as a team.

“Chelsea lost two great players in ­Didier Drogba and Michael Essien.

“Then players who have been so ­important like John Terry and Frank Lampard are not even getting games.!

“It is amazing how much a team can change in 12 months, but that is ­football,” Aimar added.

Meanwhile, Frank Lampard has revealed he has taken up yoga in a bid to carry on as long as Ryan Giggs.