Hull manager Steve Bruce hit out at his side's "awful" performance after striker Nick Proschwitz denied League One Leyton Orient a shock victory with a last-gasp equaliser.
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David Mooney's strike 12 minutes from time put the visitors on course for the FA Cup fourth round, but Proschwitz earned a 1-1 draw and a replay by heading home in the fourth minute of stoppage time.
"We can't be any worse playing down at Orient than we were playing out there today," a perplexed Bruce, who made nine changes to his starting XI, said.
"It was absolutely awful. Were there any positives? Well, it did not rain.
"Only three players - the two central defenders and the goalkeeper - came anywhere near to producing what they can, and the rest did not.
"The one thing you can say is that a lot of the players need more games, as a lot haven't played recently.
"However, we had an experienced team out there on the pitch and they just did not perform at all.
"Will I play the same players in the replay? Possibly.
"We have quite a record in the Cup. I think we've only made the fourth round in two of the past 25 seasons.
"If I'm honest it's a replay we could possibly do without, but we're still in the draw and still in the FA Cup."
Orient manager Russell Slade felt his side should have been awarded a penalty before Mooney's goal when the striker appeared to be hauled down by Hull defender Alex Bruce, who was the last man.
"I do think it was a penalty," Slade said.
"He [Mooney] wouldn't want to go down in that position. He was hauled down so it was a penalty.
"But he took his goal well and he's very confident at the minute. It was a great cross and David finished it really well.
"We were positive but it was the manner in which we were disciplined and organised that pleased me.
"They have a very strong squad and we knew it was going to be a tough afternoon for us.
"It was probably one of our best performances of the season, particularly without the ball. We created a few chances, but we didn't have loads of problems defensively and that was the most pleasing aspect.
"You have to be disappointed having conceded so late on after having played so well.
"I thought we could have done a little bit more to stop the cross, and that was probably only the second free header they had in the whole game.
"It was disappointing to concede that goal as I think we did enough to go through in the tie.
"But the players are professional and we need to bounce back."
After Proschwitz slid a shot just wide early on, Orient had the better of the first half.
Leon McSweeney forced Hull goalkeeper Eldin Jakupovic into a flying save with a dipping right-footed shot from 30 yards, and Kevin Lisbie blazed over after a flowing move.
However, the best chance fell to Lee Cook, who seized on a poor back-header from Andy Dawson before having his shot smothered by Jakupovic.
The visitors took the lead when Dean Cox delivered a superb cross from the right and Mooney headed home from close range.
Visiting goalkeeper Jamie Jones saved well to deny Proschwitz as Hull pressed for an equaliser, but the German forward finally got his goal as he powered home Tom Cairney's cross from the left.