Cahill has made just one Premier League appearance this season and has also attracted attention from Championship clubs, Sheffield Wednesday and Aston Villa.
The former England star is currently behind David Luiz, Antonio Rudier and Andreas Christensen in the pecking order under Sarr’s squad.
“As we have seen in the last matches, the captain is Cahill, like in the last match [against Derby in the Carabao Cup],” ESPN quoted Sarri as saying on Friday.
“When he isn’t on the pitch, our captain is Azpilicueta. Our captain is Cahill.
“Cahill was the captain last season,” Sarri added. “I spoke with his teammates and they all told me he really was a very good captain.”
Sarri’s men will take on Crystal Palace in a Premier League clash Sunday evening.
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