However, the Belgian playmaker was unable to help Chelsea FC to find the winning goal against West Ham United as they slumped to their first draw of the season.
Sarri's side are still part of the leading pack in the table, but he believes that it will take as long as a year of playing together before his side can match Jurgen Klopp's.
"We started to work all together 35 or 40 days ago, 35 or 40 days and less time [because of breaks] with the global teams. We have to work and improve and then maybe in a year it will be the same level as Liverpool".
The Germany global joins Pedro Rodriguez on the sidelines, but the Chelsea head coach is hopeful of being able to call upon both when Liverpool visit Stamford Bridge in the Premier League on Saturday. It was just getting us to gel together, obviously signing nine players at the beginning of the season and a new manager, it was always going to be hard. "I knew that West Ham is a very good team".
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New England has been desperate for wide receiver help with Cooks gone and Julian Edelman serving a suspension. Tight end Jacob Hollister, who has shown promise as a receiving target, also was also inactive.
"We need to move the ball quicker, " Sarri said, "and we need more movement without the ball".
Maurizio Sarri is expected to make a number of changes to his first team line up with both Zappacosta and Christensen heading back to the bench and David Luiz and Azpilicueta taking their place in defence.
The visitors were on top for long spells of the game but West Ham might have taken all three points had Andriy Yarmolenko not missed a glorious chance for them with 13 minutes remaining.
Michail Antonio was also at fault for missing two good chances in the first half of the match and shouldered a modicum of the blame. They shouldn't overlook West Ham, however, as the Hammers will be looking to build on what was a very impressive performance last weekend.
Better in the second half.
"They were cutting out very well every pass for [Olivier] Giroud, so we needed two wingers, I think". But today it was very hard to play inside. "At this moment, I don't know".