The Chelsea boss appeared to question his striker's age earlier this season and the star has now claimed the Portuguese can become a different person in the build-up to matches
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The Blues boss oversaw an impressive 6-0 win over Arsenal on Saturday, which pushed the club four points clear at the top of the Premier League table.
But Mourinho was caught out earlier this season, as he appeared to call Eto'o old during a sponsor's event in Nyon – and was unaware he was being filmed.
But the Cameroon striker has now put the jibe down to Mourinho putting too much pressure on himself.
"He becomes someone else in the build-up to matches,” he told BeIn Sport. “Like any human being, he sometimes loses his mind.
“He proved it sometimes like when he did it with me [by calling me old] but he takes all the pressure on himself.”