Steps were forced to cancel the final two dates of their UK tour yesterday after a mini-COVID outbreak among their team.
Further cases have since been confirmed among the touring party, however, necessitating a delay of last night's date in Cardiff and tomorrow night's Bournemouth gig until summer 2022.
In a statement on social media, the group said: "Hi everyone. Unfortunately we now have further positive Covid-19 cases in our touring party which have made continuing with the What The Future Holds tour impossible.
"For the safety of everyone involved in the show we have decided to reschedule tonight's Cardiff show and Wednesday's Bournemouth show to summer 2022 (dates to be announced soon).
"We have tried every way possible to continue with our final show, however we have to put everyone's health and safety as our top priority.
"We are so disappointed to postpone these shows as we were really looking forward to performing for you all.
"We appreciate your continued support and hope you will join us in wishing those affected a speedy recovery. - Claire, Faye, H, Lisa and Lee X."
The group will mark their 25-year anniversary in 2022.