Northampton Town boss Gary Johnson says there is a lot of work to do before the start of the League Two season.
The Cobblers suffered a 2-0 friendly defeat to Cambridge United on Tuesday.
Johnson told BBC Radio Northampton: "We had a few who didn't look at the races and we didn't look the force that we think we're going to be.
"There's no excuse for poor passes or not running enough. We've got two weeks to get it right.
"We're losing in both penalty boxes at the moment, and every mistake we make turns into a goal," added Johnson.
"They're all man enough to hold their hands up and say they didn't perform. Other than Lewis [Young], everybody else didn't do much."
Johnson looks set to be without Shaun Harrad for the start of the season, after the striker picked up an ankle injury.
Meanwhile a deal for Austrian midfielder Marin Pozgain could be dependent on agreeing a move for another, unnamed Austrian forward who was on trial with the League Two club in June.
"Shaun is out for two or three weeks, so we're a bit short there. With Pozgain, there's been no decisions yet.
"We're just making sure the striker can come over as well - they come as a pair. There's a club that need to give us permission to bring him over."