The Catalans are looking to bolster their defence with a commanding figure this summer.
German international Hummels fits the bill, and according to reports in Bild the player has a release clause of €37 million which will run out on April 1.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.