Neymar ruptured the anterior cruciate ligament (ACL) and meniscus in his left knee on international duty.
He underwent surgery earlier this month in a Belo Horizonte hospital.
The 31-year-old is responding "very well" but the recovery will be long and he must focus on the process, Lasmar told a press conference at Brazil's training center in Teresopolis.
He knows that it's a process that he's going to need all of us, physiotherapist, fitness trainer, so that we can have Neymar (back) as soon as possible," said the doctor.
Lasmar, who carried out the surgery, said it was not yet possible to set a date for the Al-Hilal player's return.
Persons:
Rodrigo Lasmar, Neymar, Lasmar, He's, we're, Hilal, Ederson, Athletico, Bento, Rodrigo Viga Gaier, Angelica Medina, Pearl Josephine Nazare, Pedro Fonseca, Ken Ferris, Peter Rutherford
Organizations:
RIO DE, Al, Saudi Pro League, Paris St Germain, Argentina, Manchester City, Chelsea, Premier League, Athletico Paranaense, Thomson
Locations:
RIO DE JANEIRO, Brazil, Belo Horizonte, Teresopolis, Barcelona, Colombia