Mark Randall suggested he and his Dons team-mates expected to beat Crawley even before they walked out onto the pitch, following the 2-0 defeat on Saturday.
Randall, who made his first start since returning to the club in March, was part of a threadbare squad to face Jon Gregory’s side.
But a disappointing display put paid to their chances of snatching a play-off late in the day.
And the midfielder believes it could’ve been down to complacency.
“We’re all a bit down today,” he said. “We just weren’t good enough.
“Maybe we thought we were going to beat Crawley before we came out on the pitch, and that’s not a good attitude to take in this league.
“If you think that, you’ll get turned over like we did.
“I’m very disappointed in the result. I don’t think we played well.
“The first half was poor, but we picked ourselves up in the second half.
“I think if we’d have got an early goal, they’d have gone. But we couldn’t do that.
“They took the lead and kept it.”
And the defeat means Dons have lost five in a row at home, and are six without a goal at stadium:mk.
“We only had a couple of chances and that’s not good enough at home. I can’t put my finger on it. I really don’t know.
“It might be pressure, but the fans here are brilliant home and away.”
Randall’s contract expires in the summer, but he hopes to stay on next season.
He said: “I’ll work as hard as I can here, and hopefully the gaffer will offer me something here. If not, I’ll have to look elsewhere.”