Nuno was bitterly disappointed with Wolves' loss to Southampton on Thursday.
The 2-0 defeat saw Wolves miss out on a chance of reaching the FA Cup quarter-finals.
"It was a tight game, tough, competitive with few spaces against a good side," Nuno said after the game. "In the second half, the way we conceded the first goal - I'm very disappointed with that, very disappointed.
"We are not producing enough. The final touch is not there and we are not clinical enough. We have problems in the final third of the pitch.
"It requires improvement. It requires better decisions and it is our job to improve our players. On Sunday we are going to face Southampton again and we need to give them a better fight."
