Traffic Eng - VM's routing

All, I'm working on trying to move VM's from site A to site B, simple enough motion to complete. The issue is the VM's on site A have to stay the same so once the VM's are moved across they still have site A address but are location now on site B, so what happens is return path for the VM traffic will go to site A (typical routing) My questions is for any fellow engineers is have you tried to do this before , I know we can could do some policy routing to control the traffic but has anyone tried this using MPLS TE or by using separate VRF;s Any hints or tips would be awesome! Thanks!