He has successfully featured on the left of the club's front line in recent appearances.
On Werner, Postecoglou told reporters: I think he's been really important. If we hadn't brought him in there would have been far more of a burden on the other players, especially with Sonny away.
We threw him straight in. He's made an impact but I think he can get even better."
He then added on the form of young winger Brennan Johnson: I don't know about difficult decisions. They're easy decisions (selection).
The good thing about Brennan is he's contributing. Overall his year we've seen growth in him playing in a way that is different for him. They're all there in front of me with the opportunity to start or not start."
