Willian has told ESPN Brasil that this season's all-English Champions League and Europa League finals prove that the Premier League is more formidable than ever before.

Chelsea face Arsenal in the Europa League final in Baku on Wednesday before Tottenham take on Liverpool in the Champions League final in Madrid on Saturday -- the first time that one country has accounted for all four finalists across UEFA's two top club competitions.

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"I always say that the Premier League is the toughest championship in the world," he told ESPN. "Lots of players dream about playing in the Premier League someday and it's clear to see why.

"The fact the four English teams are playing in the Champions League and Europa League final shows that the work is being well done.

"Liverpool are in the Champions League final for the second time in two years while Tottenham will be playing for the first time. Chelsea and Arsenal are no strangers to those types of matches either.

"The Premier League is growing as we speak, and it gets harder by the hour. This is why English teams are in the final of two tournaments like these."

Chelsea's showdown with Arsenal at Baku's Olympic Stadium will also bring Willian back into contact with former teammate Petr Cech, who is in line to make his final professional appearance before retiring and holding talks over an executive role at Stamford Bridge.