Former UFC heavyweight champion Cain Velasquez has resumed light training for the first time since undergoing back surgery, but there is still no timetable for his return.

Velasquez (14-2) provided an update on his health this week, in post on social media.

"As you know, I underwent surgery in early January," Velasquez wrote on Facebook. "That surgery was very successful, and I hope the issue doesn't ever come up again.

"However, right now I am listening to my body and the advice from my medical team and choosing to take it easy. I'm still staying in shape, but getting back into fighting shape is going to take a bit more time as I can't train the way I know how.

"I can't provide a definitive timeline on when I'll be ready to go, but you'll be the first to know when the time comes."

Velasquez, 34, underwent a procedure to address a nerve issue in his lower back. He was scheduled to fight Fabricio Werdum at UFC 207 in December, but was pulled by the Nevada State Athletic Commission for medical concerns.

Fighting out of American Kickboxing Academy in San Jose, Velasquez fought once in 2016. He knocked out Travis Browne in the first round of a fight at UFC 200 in July.

The heavyweight picture should change drastically in May, when defending champion Stipe Miocic (16-2) faces Junior dos Santos (18-4). Werdum was also expected to fight on the card, however his status is in the air after opponent Ben Rothwell was flagged for a potential anti-doping violation.

"I'm excited to see the latest heavyweight fights, especially those scheduled for UFC 211," Velasquez wrote. "I'm confident I'll be facing someone from that group because I belong there, and I want nothing more than to get my belt back.

"Again, I take my health and the longevity of my career very seriously. Just as important to me is what I deliver to all of you. ... I'm not willing to dishonor your loyalty or the hard earned money you guys invest to watch me fight. I won't fight unless I can show you what you deserve and paid for."