Blanc replaces Carlo Ancelotti, who asked to leave the club after winning the title last season for Real Madrid.
Paris St Germain looked at a number of options, including Andre Villas Boas and Fabio Capello, before going for Blanc.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?