City's xG total from their opening eight matches this season is 21.5 - a rise on the figure of 17.5 in the corresponding fixtures last season.
'Obviously they were a bit cautious of the way we played and I think we have earned that respect, ' said the Holland captain.
"We want to get as close as possible and do as well as we can but we know it is going to be hard". But I said already in an interview, we have to start thinking about the players.
Graeme Souness also doubts Chelsea, who have also won their first two Europa League games this year, will challenge for the title.
On the game against City itself, Robertson admitted: "We can play a lot better but on days when you are not at your best it is important not to drop points". We have played City often and they are outstanding.
Six of those matches were against opponents ranked in the top 15 in the world.
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Klopp and his City counterpart Pep Guardiola were satisfied with their team's displays in a tight, tactical encounter which finished 0-0 at Anfield, but the German was clearly frustrated to now lose his players for global duty. The Cityzens are level on points with Chelsea and Liverpool but their goal differential is better than the other two. After a tough trip away to Napoli in the Champions League where the front three just didn't click, Liverpool again looked quite boring in attack.
"As a back four, that's what we go into every game going for".
Yet he was typically tough on himself after gifting the late penalty by diving in on substitute Leroy Sane, with the towering centre half insisting it is lesson he must learn swiftly. Eighty-five minutes, you obviously get a bit tired and that moment goes by in a split second and I chose to dive in, which is not what I would normally do.
United have plenty of time to make up the ground they have lost on the leaders, but there is a reason they are already off the pace and, like the Gunners, I think their main aim now will just be to finish fourth.
"At the end we need to be happy - I need to be happy - that we didn't lose it because of the penalty".