Hull boss Phil Brown was left with his side's second-half display in the 4-1 defeat at Sunderland and admitted there was a lot of work to be done on the training pitch.
The Tigers capitulated in the second period and some shambolic defending allowed Andy Reid, Darren Bent and Hull old boy Michael Turner to all score and Brown aims to put things right during the week.
He said: "The most important part of a footballer is what goes on between his ears and in the second half, I don't think our focus was right and I don't think we applied ourselves the way we applied ourselves in the first half.
"There were a lot of positives to come from the first half in terms of the way we played. The display was quite pleasing.
"But in the second half, unacceptable defending and individual errors have cost us dearly. That takes work on the training field, and that's exactly what we will be doing this week."