The coach believes that the new arrival brings something unique to the squad, as demonstrated by his piece of play for the Catalan club's opening goal on Saturday evening.
"People know about Memphis because he was at Manchester United and Lyon," Koeman said of his countryman.
"Today, he showed he can score as he scored the first with an individual piece of play.
"With his play, speed and strength, he gives other things to the team.
"His partnership with Antoine Griezmann was very good.
"We have players who can play in different positions in attack.
"We'll also have Sergio Aguero. I hope Leo [Messi] returns too. So, we have quality up front."
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