A 3-3 draw at Brighton on Saturday – having led 3-1 at half-time – means Nuno’s side have failed to keep an opponent at bay since beating Crystal Palace at Molineux on October 30.
Having kept 13 clean sheets last season, the club’s highest-ever tally in the Premier League, this is an unprecedented run under the Portuguese.
And Nuno recognises the need to put things right soon as he said: “We are defending bad.
“We are making mistakes that we shouldn’t make.
“We have to improve individually and as a team.
“It’s not normal. Look at this game for example, it didn’t work out.
“We entered back into our shape (five at the back) and we still concede.
“We have to improve and be much more aggressive, a bit more capable of dealing with individual situations. We have a long way to work.”
Joao Moutinho gave away a penalty 11 seconds into the second half at the Amex which saw Brighton pull one back through Neal Maupay before having skipper Lewis Dunk equalise.
It proved a costly error from the veteran midfielder, but Nuno insists the onus is on everybody to step up over the coming weeks.
“I’m not disappointed with Joao, I’m disappointed with me, with everybody,” he said.
“We must do better. After the first half, we must do better as a team.
“I’m not disappointed in any way individually with any of our players, it’s about us.
“It’s about finding what’s happening because in the previous game we let a good game get away after a fantastic performance.
“Again, in the first half we do a fantastic job and the game goes away.
“We must look to ourselves and find the answers for it.”
Nuno, whose outfit are hosting Crystal Palace in the FA Cup on Friday, added: “Brighton are a good team and will react, if you pass through that period you see the game out.
“Football is about momentum. It was about having two or three good spells of possession with the ball.
“You can control it. When you score three goals away from home, usually it means you take the game.
“We’ll take this one, like we took the previous one, and we’ll go for the next one.
“Always with the same idea, let’s compete. It’s about educating and helping these young players to become better.”