The Italian was in charge of the Blues between 2009–2011 and won the Premier League and FA Cup in his debut year.
Meanwhile, Lewandowski was building his reputation at Polish side Lech Poznan before joining Jurgen Klopp at Borussia Dortmund in 2010.
And the 27-year-old went on to be prolific for the German side, scoring 103 goals in 186 appearances, and winning back-to-back Bundesliga titles.
The Pole left Dortmund in 2014 and joined Bayern Munich, where he has continued his fine goalscoring record, this season scoring 22 goals for club and country.
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