Joseph Parker's handlers are investigating whether they can appeal his loss to Dillian Whyte.

Whyte beat Parker by a unanimous points decision in their heavyweight fight in London last weekend.

A review of the fight has left Duco Boxing believing their earlier suggestions that Parker was hard-done by in a result that was scored 113-112, 115-110, 114-111 by the three-man judging panel.

PHOTOSPORT Joseph Parker congratulates Dillian Whyte after the fight in London.

Their major point of concern was the head-butt that floored Parker towards the end of a second round he had clearly dominated.

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They argue that if Parker had been given that round 10-9 instead of losing it 8-10 by way of a "knockdown" awarded to Whyte, the fight would have been a draw.

"It's clear that the clash of heads in the second round had a significant impact on the fight – both in terms of the scorecards and Joseph's performance in the middle rounds," Duco Boxing said in a statement on Thursday.

"In light of what is clear evidence of a significant error by the officials, there is a legitimate question as to whether the result should stand. That's a question Duco will be asking the sanctioning bodies on Joseph's behalf."

The fight had the WBC's silver title and the WBO's international heavyweight title at stake.

Normally a clash of heads of that power could see the victim awarded a five-minute recovery period.

Duco's review also backed up their earlier feeling that Whyte had been allowed to get away with too many questionable tactics too often.

The fight was refereed by veteran British official Ian John-Lewis.

PHOTOSPORT Parker gets pushed into the ropes by Dillian Whyte.

Without wanting to take away from Whyte's effort, there is a feeling of a miscarriage of justice from the Kiwi camp.

Duco have compiled a 3:45 video of what they see as problematic holding and hitting behind the head from Whyte.

VIDEO TIMELINE:

Rd 2, 2:43: Parker is knocked to the floor in an accidental head clash with Whyte and he is forced to take a standing count he shouldn't have.The 'knockdown' allowed Whyte to win the round 10-8.

Rd 4, 0:29: Whyte charges at Parker, wraps his arms around him and forces him into and almost over the ropes. Referee Ian John-Lewis has a quick word with the Brit.

Rd 4, 0:48: Whyte punches Parker around the back of the shoulders then wraps his arms around the Kiwi.

Rd 4, 1:22: Whyte misses with a right, wraps his arm around Parker and pushes forward with his head. Ref intervenes and again talks to Whyte.

Rd 4, 2:05: Whyte pulls Parker's head down with his left glove and lands an uppercut with his right. Parker's corner is furious and yelling at the ref.

Rd 5, 2:01: Whyte grabs Parker in a headlock with his left arm.

Rd 6, 0:41: Both fighters have an arm around each other while punching with their free arm. Whyte lands a couple to the back of Parker's head and the Kiwi camp are again livid. John-Lewis tells Whyte not to hit the back of the head.

Rd 10, 2:42: Whyte holds Parker's head down with his left and attempts an uppercut with his right. Ref has a quick word. Seconds later, Whyte puts his arms either side of Parker and forces him back onto and almost over the ropes again, with his head on Parker's chin. John-Lewis has another longer talk with the Englishman.

Rd 11, 2:35: Yet another punch from Whyte as he holds Parker's head down with his other arm/glove.

Rd 12, 1:11: Parker ties his left arm around Whyte, who responds by lowering his head and pushing his rival into the ropes.

Rd 12, 2:00: Whyte uses his right arm to again headlock Parker.

Rd 12, 2:49: With Parker attacking after having knocked his opponent down, Whyte drapes both arms over Parker's shoulders, slips off, then clinches him. He pushes Parker into the ropes and holds on as the bell goes to end the bout.

ONGOING CONTROVERSY

It's the third fight in a row in the UK involving Parker that has involved controversy.

Duco boss David Higgins had to work hard to have the referee changed for his win over Hughie Fury. After the fight the Fury camp were in horror at the result and the wide discrepancy in scoring was looked at but didn't see Parker's win changed.

The Italian referee in Parker's unanimous points loss in his world title unification fight with Anthony Joshua drew universal condemnation for not allowing the two fighters to engage in any close-quarter contact.