NEIL Harris pulled no punches in his post-match team talk after Millwall conceded four goals at Wolves on the final day of the season.
While a much-changed Lions side were spirited in defeat, Harris was unhappy with some "poor defending" and spelled out his frustration to his players after the game.
But Harris, appointed as the club's permanent manager this week, admitted there were plenty of positives to reflect on – namely youngster Jamie Philpot's debut goal.
He said: "I let them know that I wasn't happy and they're not going away over the summer accepting that we lost and let four goals in. That's unacceptable.
"We defended poorly. Am I disappointed we didn't get something from the game? Of course I am, because we competed and were excellent at times going forward.
"But you cannot defend like we've defended all season and, certainly from set-pieces today, and expect to get results.
"Of course the aim is to go down, rebuild and go again but there has to be a winning mentality at this club and the players saw my frustration after the game."
Academy product Aiden O'Brien had already got himself on the scoresheet when substitute Philpot poked in from close range with his first touch.
But the striker's eventful debut lasted just eight minutes due to an injury.
"I'm delighted for Jamie but a little worried about him," Harris said. "We'll see how that settles down and assess the damage.
"He's a natural goalscorer and when you've got those at the club, you want to get them onto the pitch at the best level you can.
"He deserved the right to be on the pitch today and he will score a lot of goals for this club in years to come.
"You saw with three in the starting XI and two coming off the bench that the young players at Millwall will be given an opportunity in the seasons to come.
"They will grow as a group and for the good of the club – not at the sacrifice of results – but if it takes time for them to come through, then so be it."