Liverpool were held to a 1-1 draw by Arsenal at the Emirates Stadium on Saturday evening.
Jurgen Klopp's side took the lead through James Milner in the 61st minute but were unable to secure all three points.
Arsenal frontman Alexandre Lacazette latched onto an Alex Iwobi through ball to score a brilliant equaliser with eight minutes remaining.
Liverpool's Senegalese winger Sadio Mane was unfortunate to have a goal disallowed for offside in the first half.
Mane had the ball in the net when Roberto Firmino's shot rebounded off the woodwork - but the linesman wrongly flagged for offside.
“I think it was a goal,” said Klopp after the 1-1 draw. “Do I feel aggrieved? I don’t know. It is football.
"It is a pity it didn’t count."
On Sunday, the 26-year-old winger - who was filmed cleaning his local mosque earlier this season - has spoken about the incorrect decision by the official. If only more footballers could speak in this manner.
“I haven't watched it back and to be honest I'm someone who is not really interested in this kind of thing,” Mane said, as per the Liverpool Echo.
“If you remember, when I scored a goal against West Ham earlier in the season I was offside and that goal counted.
“So if this time I was onside and it didn't count then you just to deal with it and accept it.
"Officials are human beings and sometimes we all make mistakes."
What a classy response from Mane.
No wonder he's such a popular figure on Merseyside.
Liverpool may have maintained their unbeaten record in north London but dropped to third in the table behind Manchester City and Chelsea.
The Reds visit Red Star Belgrade in the Champions League on Tuesday night before hosting struggling Fulham at Anfield next weekend.
Can Liverpool and Mane challenge Man City for the title? Let us know your opinion by leaving a comment below.