The Parliament bass player tweeted that Womack had informed him of his cancer treatment.
"I just spoke to our friend Bobby Womack," Collins wrote. "He wanted you all to know that he loves you and thanks for the prayers.
"Doctor says he is in the first stage of colon cancer, he is very upbeat about his future, we laughed & joked before we hung up. Thanks funkateers, we will get him back on the one!"
Collins had also revealed that Womack was in hospital for pneumonia before being diagnosed with cancer.
Bobby Womack's latest album The Bravest Man in the Universe is set to be released on June 11.
The LP is the soul singer's first for 18 years, and is produced by Damon Albarn and Richard Russell.
Womack has recently recorded and performed live with Albarn's Gorillaz, most notably on the single 'Stylo'.
Watch the video for Gorillaz and Bobby Womack's 'Stylo' video featuring Bruce Willis below: