Lindegaard knows it is something United have to address - and fast - if they are to still be challenging for the Premier League title in the spring.
"We should be concerned. It is a bad habit," said Lindegaard.
"We have to look at it.
"I just asked one of my team-mates afterwards, 'what would have happened if we hadn't conceded a goal?' It was like a wake-up call.
"It is a bad feeling to have conceded a goal in this match. It is very disappointing."