Lyle, 36, underwent a bone marrow transplant in December following a recurrence of acute myeloid leukemia last year.

His wife Briony has provided an update about his health.

"It's been 190 days since Jarrod's stem cell transplant and we are going through a really rough patch at the moment," she wrote on jarrodlylegolf.com.

"I'm typing this blog on his behalf because he's not able to do it.

"Jarrod's not able to drive, struggles to prepare any food for himself, can't read stories to the girls and is not able to offer much help at all around the house.

"On top of his dodgy eyesight, he is also starting to look like a very frail, sick person.

"We are both very aware of the amount of drugs and medication that has gone into Jarrod's body over the years but things are starting to get really scary at the moment.

"It looks as if this recovery is going to be the longest and hardest one so far.

"There have been some huge highs along the way but at the moment we are going through one of the lowest lows."

Lyle has twice beaten acute myeloid leukaemia, in 1998 and 2012, and been able to return to play professional golf.

He made an emotional comeback to the course during the 2013 Australian Masters before trying his luck at using a medical exemption to win his PGA Tour card back in 2015.

But Lyle returned to Australia permanently to be with Briony and daughters Lusi and Jemma, which included some commentary stints.

Australian Associated Press