Zola, who resigned as Birmingham City manager in April 2017,
has joined Chelsea's pre-season tour of Australia.
Fellow Italian Sarri, 59, was appointed Blues
boss last week after fellow compatriot Antonio Conte was sacked despite winning
the Premier League title in 2016-17 and FA Cup in 2017-18.
Zola made 312 league and cup
appearances for Chelsea, scoring 80 times.
He has managed West Ham United,
Watford and Italian side Cagliari.
Zola signed a two-and-a-half-year contract with Birmingham in
December 2016 but quit four months later after a poor run of form.
Courtesy of bbcsports
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