Chelsea assistant Gianfranco Zola insisted Maurizio Sarri needed more time to make changes at the club, comparing his situation to when Pep Guardiola arrived at Manchester City.
Sarri's side have fallen to sixth in the Premier League and the Italian is under growing pressure at Stamford Bridge.
Speaking ahead of Chelsea's fifth-round FA Cup clash against Manchester United, Zola said there were also initial questions over Guardiola, who went trophy-less in his first season at City in 2016-17.
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"How do you know that we are not making changes?" Zola said.
"We are adjusting a few things but without changing where we want to go.