Oxford boss Karl Robinson has called his players in for extra training this morning after their 2-0 defeat to Sunderland.
After a close first half, the Black Cats took the lead soon after the break when Luke O'Nien fired home.
The home side offered little in terms of a fightback, and Lynden Gooch's superb goal late on sealed what turned out to be a comfortable win for Phil Parkinson's side.
But Robinson was furious with the home side's performance, prompting today's extra training session.
"Some of the stuff in that period was atrocious," he blasted after the game, "That’s as bad a performance in the second half as I’ve seen.
"I know what I want to say, but equally I’ve got to be very careful with what I do say for the benefit of the players who are in the club right now.
"We’ll be in tomorrow morning, very early, and we’ll be going through that game."
Robinson had no problem with the Sunderland goals, with O'Nien's strike following Max Power's mis-cued shot leaving Oxford keeper Simon Eastwood with little chance.
"Their goal came from two wicked deflections and then it’s a great finish," he added.
"Easty is still on the move and he can’t do anything about that.
"It was the reaction from that goal to the second that I’m absolutely furious about.