Luton Town boss Jack Wilshere bemoaned his side's failure to be clinical in Saturday's derby defeat at MK Dons.
Aaron Collins scored the winner as the hosts beat the Hatters 2-1 for their first League One victory of the season.
It meant another disappointing result for Wilshere's side and more than 6,000 travelling supporters as they slipped to 16th in the table.
"They didn't have to do much [to win the game]," Wilshere told BBC Three Counties Radio.
"Clinical is a word that come to mind. The chances were there. That's why we're so frustrated and I'm so frustrated. In terms of everything, we didn't have to do that much to win the game and we ended up losing.
"I understand their frustration. We have to bounce back which is annoying."
The result at Stadium MK meant Luton have now lost three of their last four league games and are seven points off the play-off places after nine games.
The Hatters return to action on Tuesday, with Barnsley's visit to Kenilworth Road (19:45 BST) followed by further home games against Leicester City and Doncaster Rovers.
"That's the good thing about this league, that there's another game and we can bounce back from it," added Wilshere.
"But we shouldn't have to because we can't lose this game. The reality is we have."