The Whites were battered by Liverpool at Anfield in one of manager Jurgen Klopp's last home games at the club.
Postecoglou felt his team was not at the races, but would not put too much blame on Emerson.
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He stated post-game: We're playing him out of position and it's kind of the way our season has gone.
Whenever we've had injuries, invariably we've had them in the same part of the pitch.
Both our left-backs are out and it's kind of forced him out there. It's not great for him and he's up against a pretty good player in Mo (Salah).
Again, that's something we have to deal with."