The Release Me singer has invited Jones to join him on a tribute record to their late manager, Gordon Mills, who died in 1986.
Humperdinck wrote, "Hey Tom, I think we should put our differences aside and record a duet in honour of Gordon Mills. What do you think?"
However, he hasn't had a comeback from Jones and took to Twitter.com again earlier this week (beg27May13) to write, "Tom... haven't you answered my Tweet from last week? I miss you mate."