Arsenal and Tottenham Hotspur sit just two points behind the leading pack, too, and Robertson expects the race to involve several teams throughout the campaign.
Jamie Carragher analysed Riyad Mahrez's penalty miss at Anfield on Sunday and highlighted the excellent research that goalkeeping coach John Achterberg put into predicting the way the Algerian would take his pen.
As for what it means for the standings, there is now a three-way tie for first with teams having records of 6-2-0.
After four goal-filled meetings with City last season, the latest clash between Jürgen Klopp and Pep Guardiola's men failed to spark in similar fashion.
'I watched it because I wanted to get the rebound but I was very happy that it didn't go in. We were close, more than ever to winning here but it is better than last season, we didn't lose.
"Today they've done particularly well [against Southampton] but in a game you'd think they would do well". They now sit level at the top of table, with Chelsea, on 20 points after eight games of the season.
"Not smart to dive in there, it was a penalty", the Liverpool defender said to Sky Sports.
The change of position seemed to have a destabilising effect on the 21-year-old, who diverted Lovren's header back to Sergio Aguero in the penalty area. We played very strong and hard today and missed some chances.
"We hope that they come back healthy and play these easy competitions, the Premier League, the Champions League and all this". We know how complicated it is playing in this stadium and how risky they are.
"To respond is really important, but to respond is really hard when the next opponent is Manchester City because there is no time for any wrong thoughts or whatever".
He does believe Liverpool will be one of them, though. "It looks like they are in a good shape", said Klopp.
"In that situation, we help strikers when that happens".
"They struggled to get a foothold in the first half". "We had a clear chance in the last action so we controlled quite well. I would not like to speak about the referees, about the decisions", Guardiola said when asked by Pro Soccer Talk.