Roy Keane says Sunderland will cull 'one or two' players after their comprehensive 3-0 defeat at Wigan Athletic.
Goals from Emile Heskey and penalties from Denny Landzaat and Antoine Sibierski condemned Sunderland to their first defeat of the season on Saturday.
But the comprehensive nature of the defeat is what is particularly concerning for Keane.
"I'm obviously disappointed," he told Sky Sports. "Disappointed to lose the game and to concede three goals, so we'll have to take our medicine today.
"We never got started, and in any game you've got to start well. We had one or two half chances.
"But some days I believe you've got to lose to win and I found out a lot of things about different people today."
The Black Cats boss will keep everyone at the Stadium of Light on their toes with his comments, suggesting he could shift some players on in the remaining days of the transfer window.
"All the players are invited with us on this journey, but one or two will always fall to the side," he added "We learned a lot from today.
"It's probably a good thing a few of them are away on international duty.
"They can go away and represent their countries, which is nice, but then we're back into Liverpool - a nice easy one next weekend."