Southampton manager Russell Martin says their 5-0 defeat at Sunderland was "painful" to watch.
Martin says Saints have figured out what went wrong at the Stadium of Light two weeks ago.
"It was a really tough few days after Sunderland," he told BBC Radio Solent.
"We watched the game through about two or three times which was pretty painful, but you have to go through that again to analyse and learn to be ready for the next one."
He added: We are really clear on the issues we had at Sunderland. It wasn't us and it's not going to be us.