Professional Development Phase Assistant Coach Mike Sheron says Rovers were punished for failing to take their chances as the young Blues bowed out of the FA Youth Cup last night.
Gillingham earned a 2-1 victory at Ewood Park thanks to Emmanuel Fernandez's winner, but Rovers had chances to equalise after Luke Brennan has pulled a goal back from a corner midway through the second half.
Brennan himself was guilty of missing good chances late on, as was Sam Durrant, who poked wide in the dying embers in the wind and rain.
And speaking afterwards, a downbeat Sheron was left frustrated with a lack of cutting edge.
"It's pretty disappointing, we can't beat around the bush," he said.
"The dressing room is disappointed, but I thought the performance was lacklustre and at times we looked unorganised. Gillingham were getting the better of us and we had to change things up at half time.
"Going into the game we lost Jalil [Saadi] with a hamstring injury and Jack Vale was vomitting 48 hours before the game, which is why he started on the bench.
"We had some good opportunites to score a couple of goals, but if you don't take your chances then you'll be punished, and that's what happened in the end.
"We didn't get in behind them when we needed to. Jack Vale caused problems and Luke Brennan had chances to equalise as well.
"We need to treat this as a learning curve. We had a great run in the competition last season, but that won't be the case this time around."