Janet's upcoming live shows may get postponed after Joe suffered a stroke last week, reported Entertainment Tonight.
On Monday, Joe thanked fans for their prayers and assured them he's going to be okay.
"I want to thank you all for your prayers, unwavering support and kind well wishes during these trying times," he said in a statement posted on his website.
Janet is scheduled to kick off her "Unbreakable" world tour on August 31 in Vancouver.
A music video for the collaboration arrived last week.