Undo Remove Disk in Time Machine

Hi,
I used the Remove Drive button in Time Machine.  When I go back into Time Machine and hit the Select Backup Disk button the drive I want to use in not listed. I can connect  to the drive in Finder so connectivity is not the issue.  I cannot find a solution to this problem.  Any suggestion welcome.
Thanks

So you removed a drive from TM, which you were previously using as a TM backup, and then you tried to select it again?
And you did nothing to the drive in between?
TM will only recognise disks formatted as HFS Extended. You didn't reformat the disk?

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