I take it that ur using soil so it depends on what kind, if ur using a quality soil there should be plenty of nutrients in the new soil, make sure to ph your water and NOT over water and it sould turn around, How long as it been since you transplanted?
so if you transplanted, and put your plant back into the medium, how do you know you lost any root-mass? sometimes after x-plant, you will experience some droop. usually (for me) after 1-2 days, any droop passes. don't change anything with your nutes.
at most you want to give it some silica (potassium silicate is good, but not too much, as it raises your ph a lot), then, maybe some greenup spray of some sort after a couple days...
edit: superthrive (or any b1 additive) would help too.