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.
"But for us it's another important point, especially going into the worldwide break with a long break until the next game".
"That's why I say going away is not a big problem but now you call a manager of any country and ask him to leave out one or two players and he says, "I am under pressure as well" because now it's Nations League".
"We hope that they come back healthy and play these easy competitions, the Premier League, the Champions League and all this".
You have to go further down the table to find Manchester United in eighth place and, much like Arsenal, I do not see them as title contenders at all.
Blues boss Maurizio Sarri has talked about there being a gap between his team and City and Liverpool, but they can close it if they can keep Hazard fit and in the kind of form he is in at the moment.
It was billed as the biggest game of the season so far but it failed to live up to those expectations as, until the last 15 minutes, both sides appeared reluctant to commit to all-out attack for fear of what the consequences at the other end may be.
"Today they've done particularly well [against Southampton] but in a game you'd think they would do well". It is for both teams it was really intense and both showed respect for the other team.
He does believe Liverpool will be one of them, though.
The previously unstoppable Liverpool registered just two efforts on target, with City mustering the same. We defend so well as a team; it starts from the front with the work-rate they put in. In fact, I am still not sure they will make it into the top four. We were back on track even after we had to change Milly [James Milner] which you never want to do, especially in the first half.
City defender John Stones said the players had decided among themselves that Mahrez would take the kick after impressing with his spot-kicks in training last week.
"We were very strong defensively", he added.