Leeds United boss Neil Redfearn has lamented Liam Cooper's decision making in the 4-3 loss at Wolves.
Speaking to LUTV, the head coach explained how the centre-back forgetting his instructions and breaking the shape of the defence proved costly for one of the goals.
As Wolves netted through early in the second half, club captain Cooper had chased the ball down in midfield leaving a gap in defence for the home side to exploit.
He said: "The second one's most disappointing. I don't know why Coops went. He played well today, but for just that one moment Coops came out of position and the lad slid in."
Cooper was in the side ahead of Italian defender Giuseppe Bellusci, who Redfearn confirmed is out with a hamstring injury.
Unfortunately for Cooper, he did not re-announce his return on a good day for the defence, shipping four goals, despite making 17 clearances himself on the day.
While Cooper has made impressive strides in his first season at Leeds, the club have actually looked better when Sol Bamba and Bellusci are paired at centre back.
One simple error is enough to cost the team at this level, and among Redfearn's challenges is to ensure players like Cooper who are talented yet inexperienced, can keep their concentration for 90 minutes.