The Dane has expressed frustration over the lack of minutes he's seen this season, but has featured in recent games.
Postecoglou said: "He was good.
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"Him coming on at half-time really helped us as it was a game that needed something different to what we usually have.
"Pierre has been good. He has not started as many as he probably would have liked, but he has done a good job for us. We are in a good place where I can make these changes within games."