Chelsea missed the midday deadline for Higuain to be eligible to face Spurs in the second leg of their Carabao Cup semi-final tie after the striker arrived in England on Wednesday morning and had to undergo a medical.
Head coach Sarri believes Higuain is one of the best strikers he has ever worked with, following their successful time together at Napoli, and that he can hit the ground running to revive Chelsea’s season.
Asked if Higuain will play against Tottenham, Sarri said: “Midday? It's impossible. For tomorrow, I think, it's impossible.”
Sarri added: “He's a very strong striker. Especially in my first season in Naples. He did very well. He scored 36 goals in 35 matches in Serie A. That season he scored 39 goals. So he did very, very well. For sure, he is one of the best strikers in my career.
“He played four seasons for Real Madrid, I think. I think he has the right experience to play here.
“We hope he brings goals, that he starts scoring for us. He's also very good at other aspects, other than just goals, but that's what we are hoping for. He has had some difficulties recently, but we're hoping we can raise him back to his best form.”
Sarri also laughed off Andreas Christensen’s disappearing act from the Chelsea substitutes’ bench with 15 minutes of the defeat to Arsenal still to play.
Laughing, Sarri said: “I was worried, more than anything. You know very well that, on matchdays, Christensen always has stomach ache. I don't know the reason, but he's very nervous. He had to go to the toilet, so I don't know what to say.”