Male Fertility and Transplantation

Male fertility has not been studied in detail in transplantation.  Does immunosuppresive therapy have impact on sperm production or motility?
Most reports suggest that male transplant recipients have successfully fathered healthy kids.
The one drug that might have led to problems is sirolimus: On observational study showed that sperm count was decreased in the sirolimus arm of the study and that could affect pregnancy outcomes.  No data exists on other agents at this point.

Ref
http://www.ncbi.nlm.nih.gov/pubmed/18510638
http://www.ncbi.nlm.nih.gov/pubmed/17714220
http://www.ncbi.nlm.nih.gov/pubmed/19601935