1 or 2 tenants subletting - what to do with the lease in place?

[Dan Barth]

Hi BP Community,

I have a rental in Philadelphia with 2 tenants that are both on the annual lease that goes until the end of Sept.  One of the two tenants recently got a job out of state, in which they want to sublet and has a candidate that meets all of screening requirements.  If I move forward with this candidate and allow the sublet, how should I proceed in updating the lease/ creating a new lease with the new tenant?  What options do I have? 

Any help would be greatly appreciated!!