Former Norwich City striker Iwan Roberts believes failure to resolve defensive frailties is a big reason for Johannes Hoff Thorup's downfall as head coach.
"I watched the first half of the Norwich-Portsmouth game (on Friday) and made a tongue-in-cheek comment to my son after the game, I said 'that's a sackable offence', conceding five goals against a team that had scored seven in their previous 12 games," he told BBC Radio Norfolk's Canary Call.
"I wasn't serious in what I said but I was worried about him after that horrendous defeat.
"Then going down to Millwall yesterday and losing that one in the manner that they did, set-pieces have been an Achilles heel all season, and they conceded another two yesterday.