when I bring a new/unfamiliar LGD onto the farm, I put it in a kennel where the other dogs can come up and meet the dog through the fence. Once everyone has been introduced through the fence, I will let the new dog out. Usually a week to 10 days is sufficient.
I personally would not be confident to just have the dog in a pasture, as all of my dogs can figure out how to get in and out of fences and would fight with the intruder. By putting the dog in a kennel, it stays safe while the other dogs figure out that it is an acceptable addition to the farm.
Tamarack Prolific and Ile de France crosses