Asked whether the title is unrealistic, Sarri added: "I think so".
"Of course (I'm open to having him)".
"For sure he will be a point of reference for me, for everybody here [if he returned]".
"If there is a pitch and there are 11 players, I feel at home anywhere", Sarri said.
Terry is a free agent and has been training occasionally at Chelsea's training ground after spending a season in the Championship with Aston Villa, which remains a possible destination.
While the Blues have managed to adopt Sarri's offensive tactics very well, with the club now having made the most passes of all Premier League sides with 2,995 and a passing accuracy of 89% (equal to Manchester City), the Italian feels that there is still room for improvement, particularly on the defensive phase of their game - something he had earlier mentioned needs a complete change of the mind.
'If he can stop them from conceding goals as they adapt to his style, Chelsea have the potential to be sensational.
Sarri, as quoted by West London Sport, was led to believe that Abraham had no intentions of departing Stamford Bridge in the summer initially.
"In a few days, one week, he will be ready to play". At the moment he is able to be on the bench.
Ahead of Chelsea's clash with Cardiff City on Saturday, manager Sarri said: 'My feeling is that we are not a very solid team in the defensive phase.
Chelsea FC are aiming to at the very least break back into the top four this season after the Blues ended up in fifth place last term under Antonio Conte.
"At the moment I can answer Manchester City or Liverpool", the Italian Sarri, was quoted as saying, while revealing the teams he thinks were true title contenders.