Johannesburg - Lions president Kevin de Klerk vowed to appoint a defence coach following his team's 41-26 loss to the Reds in the Super 14.
The Lions, who are bottom of the table having lost all eight of their games, conceded four tries in the first 18 minutes against the Reds on Saturday.
De Klerk called his side's defence "unacceptable", adding on the Lions' website: "We simply cannot play catch-up every time."
Coach Dick Muir was forced to justify team selections last week after disgruntled supporters wrote letters to the union demanding an explanation for the poor results.
The Lions have conceded 354 points this season, nearly 100 more than the second-from-bottom Cheetahs.