Arsenal boss Mikel Arteta admits they need to develop a cynical streak to their game.
Arteta was responding to their midweek Champions League defeat at Porto.
He said: "Yes, we certainly can develop a lot of things and those experiences are really relevant to judge whether we were or we weren't. Just because a goal [was scored], I don't think it's that fair and I was very clear with them about it because I believed that they did a lot of things right.
"But managing games and things like that, we can still improve. But in a year's time for sure, we can still improve, and we can improve in our build-up phase, and we can improve in our restarts. We can improve in many areas.
"I don't know if it is [being] a bad guy, but you have to be tricky, you have to be smart, you have to be street wise and you have to try to take advantages in every situation. They know that.
"That's a thing that has to be developed - you don't have it, that's for sure. The best teams, the best players, they have that."