Wolves captain Conor Coady admitted frustration after their 3-2 home defeat to Tottenham.
Wolves were 3-0 down before Spurs defender Juan Foyth conceded two penalties on his Premier League debut - Ruben Neves and Raul Jimenez scoring from the spot.
Coady said: "We've conceded three sloppy goals - it is not good enough from our point of view, no matter who it is against.
"We need to look at this week and work on it defensively. They're a top team, so we can't switch off at any moment."
On the disallowed goal at 2-0 just before half-time, he added: "We got told at half-time it was a couple of yards on. When things like that go against you against a top team it is difficult.
"But we always see a way back because we are a team full of character, we always fight for the club. But the third goal didn't help us.
"We showed fight but it wasn't enough. There are positives we can take, when we lose we learn."