Middlesbrough boss Gareth Southgate felt his side went down to a "questionable" Hull winner at the KC Stadium.
Boro looked to have snatched victory from an entertaining Barclays Premier League encounter when Tuncay Sanli put them ahead with a neat flick 11 minutes from time. But Bernard Mendy equalised and Marlon King then slotted the winner from the penalty spot after Geovanni was brought down by David Wheater, who was sent off.
Southgate said: "Obviously the winning goal is pretty questionable. I think the pictures clearly show he (Geovanni) is offside to start with. He is coming back from an offside position and that gives him an advantage."
He added: "We should have defended it instead of appealing but then it just looks pretty soft and when I think about the other decisions given throughout the afternoon, for them to get a decision in that area of the field I find very surprising.
"But we can do nothing about that. We have lost the game and we have to take our medicine."
Hull boss Phil Brown suggested his side might have been fortunate over the winning goal and sending off of Wheater.
Yet after complaining about a penalty awarded to Stoke in last week's 1-1 draw, Brown felt luck had perhaps evened itself out.
Brown said: "All season we'll be complaining about referees and decisions - last week it didn't go for us but this week it did.
"It is a fabulous day for us. We were disappointed to go a goal behind but that probably puts us top of the league at going a goal behind and getting something from the game.
"I have nothing but admiration for the lads. They have got a tremendous togetherness and never-say-die attitude and I can't ask for any more than that - apart from playing better football."
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