Wycombe Wanderers boss Michael Duff has all but written off his side's chances of reaching the League One play-offs this season with four games still to play.
Duff said his players have shown they do not have the right mentality following back-to-back defeats by Stockport County and Bradford City.
His side are 11th, five points outside the top six, and face another team higher in the table when they travel to his former club Huddersfield Town on Saturday.
"I think that's the play-offs done for us now," Duff told BBC Three Counties Radio. "We fall the wrong side of fine margins far too often. We play well and lose far too often."
He added: "We've shown them quite a lot of stats of where we are – goal difference, third; goals scored, fourth; goals against, fifth – but we're 11th in the league, which is impossible.
"There are things we need to improve on from a mentality point of view. We've got some good players, no doubt about that.
"I said when I first came in, 'You're going to be really good for five games, don't worry about them, you'll win them,' and 'You're going to be really bad in five games, don't worry about them, you're going to lose them', that's the same at every level, every league.
"It's the 36 [games] in between that decide where you're going to end up, and we've fallen to the wrong side in those tight games far too often."
Wycombe were 19th in the table when the former Swansea City and Huddersfield boss was brought in to replace Michael Dodds in September.
The Chairboys have won 19 out of 41 games under Duff, and were briefly in sixth place after winning at Barnsley in early March.
Since then, however, they have only won two of their past seven games, losing the other five.
"I've given my thoughts, I've asked them as well," Duff said. "It's not been a one-way conversation, but ultimately, if we want to improve we need to get to the bottom of it.
"The next four games are an opportunity to find out where we're at. The challenge is to win the next four games, we don't want it petering out.
"A lot of the players were here before I came in, so they've got an opportunity to show me in the next month whether they want to be here next year. They got the full version of me in the meeting and how I want it to look moving forward."
Following the trip to West Yorkshire, Wycombe are at home to Blackpool, then travel to already promoted Lincoln City, before ending the campaign against Rotherham United at Adams Park.
