James Mortimer 29.Oct.2012Getty Images
The former All Black, who is currently playing in Japan with the Panasonic Wild Knights, injured his shoulder playing against Mitsubishi, and while he has not been formally cleared to box, his Twitter account revealed he was hopeful.
"Going in for an MRI hopefully just a small muscle tear" the Chiefs Investec Super Rugby title winner said via social media.
Later in the weekend Williams said "Results back, nothing serious, small tear, so hopefully still be able to (fight)."
Williams, who had a golden period in New Zealand, winning the Rugby World Cup, a Super Rugby trophy and the New Zealand heavyweight title to boot, will enter the squared circle for his sixth professional fight.
While in Sydney to take on Botha, a 60 fight veteran who has crossed paths with no less than Mike Tyson and Lennox Lewis, Sonny Bill is expected to formally announce his deal with the Sydney Roosters.
Panasonic are fifth in Japan's Top League standings, 14 points behind leaders Suntory Sungoliath, who defeated Fukuoka Sanix Blues 42-19 to make it eight wins from eight.