The Czech, 26, underwent surgery to tendons and nerves on her playing hand following the attack by an intruder at her home in Prostejov on Tuesday.
Kvitova faces a slow rehabilitation process after 14 days of bed rest.
The "best-case scenario" sees her on the practice court after six months.
She suffered lacerations to her left hand when struggling with an intruder who posed as a utilities man to gain access to her apartment.