Paul Lambert was furious with his side's performance as they slipped to a 2-0 away defeat at Ipswich Town.
Two second half goals from Daryl Murphy made it an evening to forget with a disappointing display at Portman Road.
Lambert made five changes from the side that faced Leeds at the weekend, but he expected much better than what was on show.
"It was rotten, it wasn't good enough," said the Rovers manager. "Not with the standards that we have set.
"I thought it was a nothing game, Ipswich are a good side and are deservedly up there on merit but I thought there was nothing in the game."
After first half in which Rovers had the better of the chances, they fell behind just past the hour mark as Murphy converted from the spot after Hope Akpan had pushed Luke Chambers.
The Irishman then doubled the home side's advantage three minutes from time to condemn Rovers to defeat.
He added: "The penalty was shocking, you don't raise your hands in the penalty box. To be fair to Hope he's admitted it was his fault.
"But we never looked like we were going to get back into it once we fell behind to the penalty.
"I made changes for the right reasons but I expect better from the ones who come in. That is the first time I've been disappointed with them in the last few months.
"Over the last few months we've been in good form, but maybe the changes did play a part but it is not an excuse as we should have been better than that."
Rovers are back on their travels this Saturday when they face Brentford at Griffin Park.
Tickets are currently on open sale priced at £23 Adults, £17 Seniors (65 & over), £15 18-21 year-olds and £6 Under 18s for terrace tickets. And at £28 Adults, £22 Seniors (65 & over), £20 18-21 year-olds and £6 Under 18s for seated tickets.
Book online today at www.eticketing.co.uk/onerovers