I presume you will be applying for an FAA licence on the basis of your foreign licence.
You should be okay as FAR 61.75(b)(4) only requires you to hold a current medical certifcate, see:
Electronic Code of Federal Regulations:
To be 100% safe when renewing your medical you could chose an AME who is authorised to conduct FAA medicals and get a FAA certificate as well. See Question 2 of the FAA procedures manual:
FSIMS Document Viewer