Spurs' erratic season continued with a 2-1 home loss to newly-promoted Ipswich on Sunday (10.11.24) and the coach says it is down to him to fix his team's topsy-turvy results.
Postecoglou said: "That's my responsibility. The inconsistency we're having this year, ultimately it comes down to me and my approach and something I need to try and fix and see if I can help the players in that area.
"We didn't start the game well at all. It was all sort of passive, without the ball, with the ball. I felt we didn't get the tempo right or intensity right and then we gave ourselves a mountain to climb. Second half we were in the ascendancy and had opportunities obviously but we didn't do enough with them."
Spurs were unable to come back from behind as they have done so many times before in 2024 although Postecoglou doesn't think there is a pattern to his team conceding the first goal.
The Australian manager said: "They're all different sorts of scenarios. When we went behind against Villa [last weekend] we were playing well.
"We weren't playing well today. So you've got to look at it in isolation today, it was a different scenario for me. I don't think it was anything like last time.
"We gave ourselves too much of a deficit to try to overcome. Obviously second half we had the opportunities to do that, but we should never have been in that position."
Postecoglou was irritated by Ipswich's time-wasting as they sealed a first league win of the season and he believed that "strategic" delaying tactics are now a common part of football in England's top-flight.
He said: "It's the way the Premier League is going. It's pretty strategic now. You can almost look at your clock around the 20-minute mark and some player will go down, they'll all come over to coach and get instructions.
"It's funny I always liked the Premier League because it wasn't like that. You would watch teams play in Europe and get frustrated by it, but now it's part of the game here as well. Nothing we can do about it."