Coventry boss Mark Robins tore into his players after a last-gasp penalty denied them a share of the spoils in a 2-1 defeat at Brentford.
The new Sky Blues manager slammed the performance as "totally unacceptable" after an injury-time Harry Forrester spot-kick clinched maximum points for the Bees.
He said: "We need to work much harder because that was simply no-where near good enough. I think everyone needs a rocket after that."
Brentford fought back after going behind in the seventh minute when David McGoldrick sprung the offside trap to run on and fire beneath home goalkeeper Simon Moore.
But Forrester levelled for the hosts just before the break when he raced on to Adam Forshaw's through-ball to slam home from 12 yards. And the midfielder popped up in the box at the death to tease a foul out of Jordan Clarke and send Coventry goalkeeper Joe Murphy the wrong way from the spot.
Brentford squandered a hatful of chances to wrap the game up long before that though, with Paul Hayes guilty of wasting two gilt-edged chances.
Despite battling well throughout, Robins was furious with his side's failure to see the game out, adding: "We were right in it and then threw it away, but we will have to take it on the chin. That doesn't make it easier to take, but the only way we will get through this is to work a lot harder."
Brentford boss Rosler was equally unhappy with a section of the Griffin Park crowd, who were calling for Paul Hayes to be substituted.
"I will not tolerate that from our fans because I know that once he scores he will get more and he's a very important part of the way we play. He will be starting on Saturday," Rosler said.
"I thought McGoldrick was outstanding so credit to Harlee Dean for the way he coped with him after the first 30 minutes. He was superb. I was pleased with the way we stuck at it and kept playing our football and delighted that someone up there was looking down on us."