He was forced to front the media during the World Cup after a drinking-related incident following the All Blacks' final Tri Nations test in Brisbane, a game in which Guildford played poorly.
He was put on alert following that incident, but Blackadder said that misconduct charge clearly hadn't worked and Guildford needed "clinical" help.
Blackadder said Guildford was still grieving the loss of his father, who died while watching his son play for the New Zealand Under-20 team as they won the final of the world championships against England in Tokyo in 2009.
"There's a real issue here that he's obviously suppressed," said Blackadder. "There's a lot of anger and emotion behind it and it takes an expert to help him. It's really hard to help someone if they don't think they've got a problem."
Blackadder said Guildford wasn't due at the Crusaders until January for pre-season training, but hoped he could travel to Christchurch from his Hawke's Bay base earlier.
"We're going to stand by him. He needs proper help and he needs to be in an environment in which he feels comfortable, and that's playing rugby."
The New Zealand Rugby Football Union said today that Guildford would be supported once the facts around the incident were established. While that means Guildford probably won't be sacked, he could still be fined several thousand dollars or suspended, as he has already been put on notice.