Mats Hummels conceded that Borussia Dortmund "got the jitters" in their dramatic collapse against Liverpool in the Europa League.
Following a 1-1 draw in the quarter-final first leg, Dortmund had leads of 2-0 and 3-1 at Anfield on Thursday, but were still unable to seal their place in the last four, with the hosts - managed by former boss Jurgen Klopp - scoring three times in the final 24 minutes to win 5-4 on aggregate.
Hummels slammed Dortmund's performance and felt it was mental weakness which caused Thomas Tuchel's men to miss out on a semi-final spot.
"When we scored to make it 3-1 we thought we were through," the captain told Sky Germany.
"We stopped defending aggressively and stopped playing football when they scored the 3-1. Then we suddenly got the jitters. We gave it away.
"Liverpool would never have come back if we would have continued to play our socks off after we scored the 3-1. We should have made the opponent chase the ball.
"Instead we just lost touch too often in defence. We just can't concede goals like that, that was too easy for them. This defeat is the one that hurts the most this season."