Subletting by tenant still at residence

[Justin S.]

One of two tenants has decided to move out middle of last month of 12 month lease.  The other tenant is wanting to sign a new lease, following current lease, and has also found another renter to start new lease with.  This new renter would also like to move in a couple of days just after the current tenant leaves middle of month.  I understand two original tenants are still on hook for original lease.  Question is in regards to subletting.  Since the tenant staying found new renter, can the tenant staying also sublet house?  Typically the tenant leaving would sublet in their absence.  Hopefully the above makes sense.  For reference this is a 2 bedroom house.