Sauber team boss Monisha Kaltenborn says Formula One needs to "be careful" about exceeding the 20-race mark.
Next year's Formula One calendar could comprise more than 20 grands prix with three new venues pencilled in.
Austria, New Jersey and Russia are all down to find a place on the calendar although the latter two have had a few hiccups in recent times.
But should all three join the schedule, there could be 21 grands prix as only India is set to be dropped.
And Kaltenborn has warned that too many races could actually damage the "overall product."
"We have to be careful what kind of overall impact this has because we know at the moment 20 races are already quite challenging for the personnel," she said.
"If you increase the number of races you have to keep in mind what implications does it have on the people to start with. Do you need more people?
"You have to also consider the market. If you saturate it too much with races it might not be good for the overall product.
"These are issues we have to look at clearly and then decide if it's good or not good. From the current structures we have, going above 20 would be too many."