The Gunners captain, who has netted 10 Premier League goals this season, temporarily left the pitch with his side trailing thanks to Neal Maupay’s 80th-minute goal.
It was later discovered that Aubameyang left the pitch to relieve himself – and Ljungberg admitted he did not even know the striker wasn’t involved in the game!
He said: “I actually didn’t even notice he went off. I just saw him come back on after he’d been off for a couple of minutes.
“When you need to go, you need to go, but if you feel bad, you feel bad, there’s nothing you can change.”
Brighton secured a first ever win at the Emirates to extend managerless Arsenal’s winless run to nine games in all competitions.
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The Gunners are closer to the relegation zone (five points) than they are to a top four spot (10 points).
Ljungberg thought his players were ‘scared’ to get on the ball against a Brighton side that had lost their past three games prior to their trip to north London.
He said: “They look very short on confidence.
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“In the first-half they were scared to get the ball, they were just standing still.