Liverpool manager Arne Slot said his side should have been awarded an equaliser in their 3-0 defeat at Manchester City.
Erling Haaland had headed City ahead before Virgil van Dijk headed in a corner to bring the champions level.
But the goal was ruled out, with left-back Andy Robertson ruled to be in an offside position as the ball hit the net.
“I think it is obvious and clear the wrong decision has been made,” Slot told Sky Sports.
“He (Robertson) didn’t interfere at all with what the goalkeeper can do. Immediately after the game someone showed me a goal the same referee allowed for City against Wolves last season.”
Despite his frustrations, Slot could have no complaints about the result.
“It was a very difficult first half for us. They were pressing us really high, we struggled a lot in the first half. It was obvious they were better than us,” he added.
“You are hoping you can get to the end of the half 1-0 behind and then there were five to 10 minutes that were influential: Instead of going 1-1, it went to 2-0.
“But that could have influenced the game in a positive way for us as the first half we were so poor.”
Asked about their title defence Slot said: “Last season when we were eight points clear it never felt it was done already, but as Liverpool manager at this moment in time I don’t think I should talk about the number one position.”
City boss Pep Guardiola celebrated his 1,000th game with a comprehensive victory, but credited the players for the success.
“My players gave me a good present with this performance against the champions,” he said.
“We had to perform good and many good things happened, they all performed to the highest level.
“Defensively it was really good. We know their threat in behind with Mo (Salah) and the quality of (Dominik) Szoboszlai and (Florian) Wirtz, and we have incredible energy with our people. Playing at home and winning is good for the international break.
“Gigi (Donnarumma) made the saves he should, both the full-backs were outstanding. The midfielders gave us a lot of passes and control.
“Of course the threat of Jeremy (Doku) was outstanding alongside Erling (Haaland).”
