Football Federation Australia is investigating a heated post-match blow-up that unfolded in the bowels of HBF Park in Perth last Friday night after Adelaide United were knocked out of the A-League finals on penalties.

The Hairdryer understands the incident report compiled by security, which sits with both clubs and FFA, alleges Adelaide goalkeeping coach Frank Juric manhandled a young security guard before barging into the referees room to dish out some verbal abuse.

Dirty Reds: Adelaide United coach Marco Kurz wasn't a happy camper after his side's shootout loss. Credit:AAP

Another unidentified member of Adelaide's coaching staff is also alleged to have yelled out "I'll kill you" to either the security guard or the officials. FFA is trying to determine who made those remarks and has sent headshots of the coaching staff members to the security firm.

No action will be taken until after the grand final but sanctions look quite possible. Insiders have described it as one of the worst incidents of referee abuse they have come across.