“I feel better day by day,” she said in Prague.

“Yesterday morning during a session [with] the doctor, I was able to move the fingers on my left hand which I think ... was the greatest Christmas present I could have wished for.”

Kvitova thanked other players, fans, her family, team and doctors for messages of support she had received.

Full recovery likely for Petra Kvitova after surgery on left hand following knife attack

“I never received so many [supportive] messages in my life at a moment,” she said. “I really appreciate that.”

Martina Navratilova was among those who wished Kvitova “a speedy recovery.”

“We can’t wait to see you back on court again,” the tennis great tweeted.

Kvitova sustained damage to the tendons in her left hand, along with injuries to all five fingers and two nerves.

Tennis star Petra Kvitova ‘lucky to be alive’ after knife attack at her home

Doctors estimate it will take her about six months to return to tennis, but Kvitova vowed to come back, sooner or later.

“I don’t care about how much time it takes, three months, six months or a year,” she said.

“But that’s for sure I want to return one day and I’ll do all I can to make that happen. I had no doubt about my return to the tennis circuit for a second.”

Kvitova won Wimbledon in 2011 and 2014 and she reached a career-high ranking of number two in 2011, but finished the 2016 season as number 11.