John Kear warned Warrington Wolves they must overcome their indiscipline if they are to come out of their current slump.
The Wolves conceded numerous penalties as they lost 44-16 to the Catalan Dragons on Easter Monday - their worst defeat since March 2009.
The defeat was their second in three matches having lost to St Helens two weeks ago, and although they remain in the top five, Kear says indiscipline cost them against the Dragons and could derail their Super League campaign.
"Warrington will be very disappointed with this aspect of their play, the element of ill-discipline," he told Boots 'n' All.
"They have conceded 94 penalties during Super League and only Widnes have conceded more.
"You just cannot afford to give players of the quality of the Dragons team field position and possession.
"Tony Smith alluded to this being a low point and he'll feel this (indiscipline) is a contributory factor to that low point. He will be working very, very hard indeed to stop it happening.
"You must put pressure on teams by retaining the football. But Warrington aren't because they are making errors.
"You must play with field position and again Warrington aren't at the moment because of the penalties."
Former Leeds Rhinos forward Barrie McDermott has no doubt that the senior players within the Warrington ranks will ensure the Wolves overcome their current slump.
"With honest hard working professionals like Ben Westwood, Adrian Morley, the Monaghan brothers (Michael and Joel) and (Brett) Hodgson - those guys will be the first to training and if they make mistakes it is about accountability," he said.
"The amount of honesty in the changing room and on the training pitch will get them out of this whole."