While the scoreline was not as sweet as last week's, it offered match-winner Mane the chance to make up for last week's disappointment.
"I heard it yesterday and I explained to Mane and his reaction was okay," Koeman said.
"Maybe that was the reason he came to the bench and to say this one they will not take it away again.
"He had a great performance - he's fast, he's a good player but his defending attitude is important for the team."
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