Tottenham boss Ange Postecoglou was left angered after their 2-1 home defeat to West Ham.
Cristian Romero had Spurs ahead on 11 minutes, but West Ham fought back after halftime as Jarrod Bowen and James Ward-Prowse struck.
Postecoglou said: "I think it's another game where we've dominated a game of football and haven't turned our dominance into something more tangible and kept the opposition in the game. I thought we were really poor in both boxes tonight - both with our finishing and both goals were terrible to concede.
"We had some unbelievable chances - for us it's another game, like the Villa game and other games earlier this year, and I said during the week our attacking play has a long way to go. In general we have a long way to go, and tonight was more evidence of that.
"Us being good means us being 3-0 up. This isn't about us playing good football, it's about us winning games of football. That's what I've said from the start. I set teams up to win games and 1-0 at half-time was not a good performance from us. A good performance would have been 3-0 or 4-0 up, as was the case against Villa. And when you don't, and give up goals you shouldn't like today then you get what you deserve."
On surrendering a lead, the manager also said: "Like I said it's just not having that conviction in front of goal to finish teams off. As simple as that. If we weren't creating chances, if we were out on feet then those kinds of things you could factor into it. But I don't see that. Because all our chances, especially in the first half, have nothing to do with fatigue. It's to do with lacking conviction, at the moment we're just going through this spell where we're playing so-called good football but I don't see that.
"All I see is us not really showing any real clear conviction in what we're doing. It's almost like we're thinking the ball will go into the net by itself but it won't. You need to have that determination to do that and you need to have that determination to keep the ball out of your net at the other end."
