Gary Bowyer slammed poor defending and missed opportunities as Rovers went down 3-2 to Brentford on Tuesday night.
Rovers roared into an early lead thanks to a Rudy Gestede strike but Bees forward Chris Long levelled with a deflected effort.
The home side went in front at the break thanks to a first league goal from Chris Taylor, but the visitors made the most of their opportunities in the second half as Rovers missed theirs.
Jota fired Brentford level, then after Rhodes, Gestede, Taylor and Cairney all missed, Andre Gray didn't as he pounced to send the visitors back to London with all three points.
"It is massively frustrating," Bowyer told Radio Rovers. "To have scored two goals and not get anything out of the game is hugely disappointing.
"I thought the lads showed a tremendous effort bearing in mind we are down to bare bones, but the lads dug deep and had a right good go.
"But if you look at the goals we've conceded they are three poor goals, it is as simple as that. The nature of all three goals are poor, they are all preventable.
"The overriding factor tonight is that we've gifted them three goals and we can't do that. You saw what a good team they were in possession but we can't be giving goals away like that."
Rovers are back in action this Saturday when Brighton & Hove Albion are the visitors to Ewood Park.
Prices are from £17 for Adults, from £11 for Seniors and Students, and from just £6 for Juniors aged 16 and under.
Why not avoid the matchday queues and book online at www.onerovers.co.uk and collect from the Roverstore collection point.