Uwe Rosler watched his side let the lead slip to go down 2-1 at Doncaster and said their search for their first away win of the season was down to being "too nice".
Brentford dominated much of their visit to Doncaster and carried a 1-0 lead into the break after Jonathan Douglas had clipped home Adam Forshaw's through ball. But a 25-yard stunner from Rovers winger David Cotterill levelled the game with 15 minutes to go, sparking Doncaster to life, and the hosts sealed the win with a powerful header from Billy Paynter.
Rosler is determined to toughen his side up to turnaround their misfortune on the road, saying: "At the moment we are too nice. This is why experienced players who have been around the block are taking advantage of us."
He added: "We need to be more ruthless, more cynical and more aggressive in those types of situation.
"The more we are talking about the away form, the more it is becoming a problem. We won't be talking about it now."
Rovers boss Dean Saunders said his side's victory masked a poor performance.
"That result has papered over the cracks and there's a lot of work to do," he said. "It's a new team and I hope they just keep winning until we sort everything out."
Saunders revealed he has lined up a Premier League defender and hopes to complete a loan deal before the trip to leaders Tranmere on Tuesday night.
"I've had to act because we've got problems at the back," he added.
"Rob Jones played with a dislocated thumb, Shelton Martis went off injured so I've got to do something because I didn't have a defender to put on the bench."