Versatile Australian defender Kisnorbo was released by Leicester earlier this summer following the expiration of his contract.
The 28-year-old, who also spent time with Hearts earlier in his career, has now linked up with the Rams for a trial period.
Goalkeeper Deeney is also training with Derby in an attempt to earn a permanent deal.
Deeney played for Nigel Clough at Burton but is now a free agent and will be hoping to impress.
Both players featured in the pre-season friendly victory over Burton on Saturday, along with fellow trialist Mark Fotheringham.