Forest kicked off their Europa League campaign with a point from Betis, as Igor Jesus scored both goals for the visitors. Antony leveled the scores four minutes from the end for Betis.
“I can’t fault the players’ effort and endeavour. Our football was outstanding at times, especially in the first half,” said Postecoglou afterwards.
“We were just missing that clinical edge in the front third. We were creating really good opportunities again, but it was through quality play and not many teams will come here and create the amount of opportunities we have.
“Second half, we sat off a little bit. I never felt really threatened by them, but we were just a little bit wasteful when we got the ball. We had some really good openings to finish the game off, but lacked a bit of calmness and composure.
“It’s the nature of football that with one goal in it, and with individuals who can hurt you, they can always get something. We’ve paid the price for that.
“The challenge now is to make sure the players don’t drop their heads at all because we’re not getting the victories. I’m really disappointed they didn’t get their rewards for their good play tonight because they would feel even better about the way things are going.
“They are tough conditions out there, with the humidity and the pitch. The environment makes it really difficult, but I just thought some of our play was outstanding.
“This group of players have been really receptive to what we're trying to do. We're just lacking that little bit of clinical edge to finish games off.”