Billy Barr says his young Rovers must learn fast following a narrow defeat at Manchester United at the weekend.
Mason Greenwood hit a hat-trick for the Red Devils on the day, completing his trio of goals with only a few minutes left.
But Barr was left ruing mistakes once again from his side, who showed character to get back into the game before losing it late on at the Aon Training Complex.
“We bounced back and were better than the week before, but we still give cheap goals away," the Under-18s chief said.
“We started well but from nothing we went 1-0 down, which knocked us. United should have had another couple of goals before making it 2-0, which came from another defensive mistake.
“We get back in it before half time to give us a lifeline and then get back in the game with Jack Vale scoring twice.
“We gave another cheap goal away, then equalise through Sam Burns. At that point there’s not much time left and it was at that point we stop playing.
“We don’t deal with a man out wide, the player beats a few of our players and scores.
“The positives are that we are competitive now. In March we lost to them by five or six goals without throwing a punch. This time we have scored three times and although we are on the wrong end of a result I’m seeing spirit there.
“We’re not learning from mistakes and that’s what’s costing us. We huff and puff as a group but bad individual mistakes are costing us.
“We’re playing against a very good Manchester United team with international footballers. From that point of view, it’s been a good experience for us."
Barr needs to see improvement from his team in terms of results sooner rather than later, admitting players can start to decide their own futures by their displays.
“As a team we need to defend better, he added. "We have been in this situation too many times over the last 12 months and things need to start changing.
"The players will be judged and they need to choose whether they stay in the game or not. They do that by performing."