The striker has been heavily criticised since the World Cup and been linked with a move aboard.
"I expect Mario to be a Milan player, we believe he can do great things and expect him to score," El Shaarawy said.
"It's important he starts scoring to lift the pressure and his confidence."
On former Milan coach Max Allegri's Juventus move, El Shaarawy was positive.
"I wish good luck to coach Allegri because he was a great coach who gave me a lot of confidence," he added to MilanNews.it.
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