Sarr shone for 70 minutes before his substitution.
Postecoglou told the club's website: He was brilliant, his energy he's got great quality, it was a great ball into Madders (James Maddison) for the first goal, and that was an important goal.
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He always gives everything. I thought he was unlucky with the yellow card, to be honest, but, again, he handled himself well. For a young man, he's very mature and the beauty of guys like that, and we've a few in our team, they've got such a high ceiling
"In fact, they've probably got no ceiling to the kind of footballers they can be."