The 45-year-old singer will be performing at London's Royal Albert Hall in November in the memory of Wogan, who died of cancer in January, reported Female First.
But Barlow revealed that the group have not yet decided what to sing and has appealed fans to send their requests.
Asked if he is excited about the gig, he tweeted, "Sure! two big songs from us! Send requests please xxx (sic)"
Rick Astley is one of the other artists on the bill and is excited about the upcoming show.
"It has been an honour working with Sir Terry across the years on Children in Need and it's a privilege to be hosting Rocks in celebration of his life. It's going to be a very special evening with some great artists performing some of his favourite tracks," Cotton said.