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The Reds drew 0-0 at Old Trafford in the Premier League after United had to make three changes before half-time.
Liverpool also suffered a major shock when Roberto Firmino was replaced by an injury after 30 minutes.
S addressing a Liverpool official websiteRobertson said the Merseyside giants wanted a win but were content with one point after failing to put pressure on United goalkeeper David De Gea:
"I thought that we had started very well and that we had the momentum, that we were moving forward, but that we had not just created great opportunities. We had one or two, but we could have had a lot more. The second half was disappointing for both teams. Few occasions have been created and many overlooked passes.
"We continued until the end.In the last five to ten minutes we were the team that was trying to win and get the three points, but a point at Old Trafford n & # 39; Is never a bad result.
"Four replacements in the first half are unknown in a match like this and the ones that were played were struggling, we need to get on better because the match was still on and when the game stopped. he has somehow cut our momentum and We should have been thoroughly after all the breaks in the game. We have to work on this.. "
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Liverpool dominated the ball but United had more shots in a fascinating encounter.
The hosts lost Ander Herrera and Juan Mata Jesse Lingard, United's replacement, had to wait a few minutes before leaving the field.
according to Ian Doyle of Liverpool Echo, The Liverpool coach, Jurgen Klopp, also felt that his team found the "interruptions" of the first period extremely detrimental to their "pace".
Liverpool has a one point advantage after 27 games, but City has a much better goal difference.
The two teams that will play the title will appear in the league on Wednesday, with Watford traveling to Anfield and West Ham visiting the Etihad Stadium.