Hull coach Peter Gentle believes Wakefield prop Justin Poore should have been sent off for what he labelled a "disgusting" challenge during his side's 27-26 home defeat.
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Poore, who has already served two bans in his first season in Super League, was put on report by referee Tim Roby for a 64th-minute "spear" tackle on Hull full-back Shannon McDonnell.
Gentle expects the Australian forward to be charged by the Rugby Football League's match-review panel on Tuesday and later suspended.
"It's lucky that Shannon is not in the spinal unit," he said.
"I thought it was disgusting. I am sure someone else will get the benefit of that."
Gentle could hardly conceal his disappointment at a third straight defeat which effectively ends his side's bid for a top-four finish.
Hull's 20-year-old centre sensation Ben Crooks scored a hat-trick of tries for the second successive match but it was once more not enough to save his side from a surprise defeat.
The Black and Whites thought they had snatched a point when centre Kirk Yeaman's 73rd-minute try tied the scores for a fourth time but Wakefield centre Lee Smith won it with a drop goal in a dramatic finish.
"I believe the effort is there but the execution is just nowhere near good enough," Gentle said.
"I'll give them a bit of slack because Jake (scrum-half Jacob Miller) has only just come in but our execution was disgraceful and we're compounding the problem with penalties.
"It's extremely disappointing at the moment. I think we've lost a bit of confidence. I brought the senior players back but I expected more tonight and I don't think we got it.
"We're all frustrated, we've just got to continue to try to get it right. We need to stand up as a team."
Hull's misery was compounded by a calf injury to stand-off Daniel Holdsworth.
"We'll get him scanned tomorrow," Gentle said.
"I'm not sure about the extent of it but I can't see it being short term."
Winger Peter Fox scored two tries, the second from an exceptional leap in the air, as Wakefield exacted revenge for two earlier defeats by Hull to secure a third straight win that keeps alive their hopes of reaching the play-offs for the second successive year.
The Wildcats' former Hull boss Richard Agar said: "On balance, I thought we probably had the best of the play.
"It was a scrappy game and the levels for both sides was not up up to where it should be but I can't fault my players' effort and commitment.
"In the second half we didn't commit as many errors, which was a feature of the game, and when we needed some plays our big players came up with them.
"Hull kicked better than us but we came up with a couple of kicks that won the game.
"We showed a lot of character and tenacity in defence. Our alertness probably let us own but our effort all-round was very good."
Some of the gloss was taken from Wakefield's victory by a finger injury to skipper Danny Kirmond, who epitomised his side's valiant efforts by chasing back in a failed attempt to prevent Crooks' 90-metre try and charging down a late drop-goal attempt by Jacob Miller.
"It typified the efforts he has been coming out with for a long time," Agar said.
"It looks like he's snapped tendons, which could be a blow for us. We'll see a specialist to see if we can patch it up."