Ronald Koeman is looking forward to seeing his new threat up front next season.
"There was a lot of interest in Sandro because, of course, he's a goalscorer, he's young and he has a big future in the game," Koeman said.
"We have been trying to bring in good players so we can have greater productivity in the team and he will bring that.
"He will bring a lot of good qualities and he's a really good goalscorer, too."
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