Be very careful of combining two therapies, unless the client is fully aware of what is going on.
When I started the Foundation Degree in Complementary Approaches to Healthcare with Thames Valley University, I was shown a newspaper clipping of a court case where someone had sued a massage therapist who had closed a massage session with some Reiki, and had then told the client "oh by the way I gave you some Reiki at the end". Said client didn't want the Reiki as she thought it was in some way evil, and so she took the therapist to court, which found in the client's favour.
It is our duty as Reiki practitioners to "do your work honestly" or "with integrity" or whatever the translation of the Reiki principles you use say. So if you're a Reiki practitioner and also a massage therapist, make it quite clear to your clients that they may well receive Reiki as a side-effect of the treatment you give. If you do a consultation before the treatment, make sure you mention it then, and get the client to agree to it.
In the hospice where I volunteer, we are required to record that the patient consented to whatever treatment we give them, and this is because the management believe this practice will soon be brought in in other situations.
In private practice, I've taken to offering therapies and the Reiki separately as an addon. This obviates all confusion.