Nottingham Forest manager Aitor Karanka says complacency could have been an issue during this afternoon's Emirates FA Cup defeat at Hull City.
A late goal from Apostolos Vellios wasn't enough to keep Forest in the competition and Karanka says his side paid the price for a below-par display at the KCOM Stadium.
He said: "It seems like we came here today thinking it would be an easy game because Hull aren't having the best time at the moment. However, they have players with a lot more maturity than we do and they controlled the game from the first minute.
"I told the players after the game that our personalities need to grow and develop. We need to learn and keep going but two mistakes have cost us the game.
"We didn't concede two goals because of the four defenders and the goalkeeper, we conceded them because we were poor as a team. Last week the clean sheet was down to the whole team and today the two goals we conceded were down to the whole team."
Over 4,000 Forest fans made the journey to the KCOM Stadium to show their support for the team and Karanka says his players must pay them back with a strong showing against Preston North End on Tuesday night.
He said: "To have so many fans here to support us is incredible and the best way for us to give something back now is to put in a good performance on Tuesday in our own stadium.
"The biggest mistake we made today was thinking that today was going to be an easy day after last week's performance. I tried to make that clear before the game but the players will learn from today and now we have to show a reaction on Tuesday."