Arsenal were held to a 1-1 draw by Manchester City on Tuesday night, at the same time as Chelsea beat 'Boro courtesy of a Didier Drogba brace.
"The gap is seven points but we've been in this situation before," said Ljungberg.
"Manchester United have also done it to us on a couple of occasions when we've been leading and they've closed the gap.
"It's just important for us to keep concentrating on our results and then, in the end, hopefully we can pull back the points.
"I still believe Chelsea will drop points. Sometimes they've had luck on their side with some bounces of the ball and then they've scored and come away with the three points.
"Maybe at the end of the season they won't have that luck and will drop some points. Then we can come back into it."
Yeah i know!