Tony Mowbray reflected that he "didn't recognise" his Rovers team in the first half following defeat to Middlesbrough at Ewood Park.
A close range finish from Britt Assombalonga midway through the first half proved the difference in East Lancashire, as Boro cemented their place in the play-off places with the victory.
Rovers went down to 10 men on the stroke of half time when Derrick Williams was shown a straight red card for taking down Ashley Fletcher.
And speaking afterwards, the boss was critical of his team for their display.
“I didn’t recognise the team in the first half. It was on par with as bad as we’ve ever been under me," Mowbray said.
“We didn’t recognise where we were going with the ball, didn’t go forward, didn’t really compete.
“The second half was better, even though we had 10 men. It was a really frustrating performance from the team.
“Even in the recent defeats the team has been pretty positive and played on the front foot, but the first half was really disappointing.
“We made changes at half time and could have sneaked a draw in the second half, having one or two really good opportunities.
“We’ll break it down tomorrow, get on with the week and see if we can put things right in the coming games. Footballers are professional and need to show a reaction as they have to be on it.
“We’ll move on and get back to what we’re good at."