Martin Whitmarsh is not in favour of the F1 calendar being extended to 21 races, saying it will be "tough" for the teams.
Next season New Jersey is expected to make its Formula One debut, having put back the inaugural race by a year as the organisers "had not complied with the terms and conditions of the contract."
However, that is not the only new race as Russia has also been pencilled in, bringing the number of grands prix to 21.
Whitmarsh, though, reckons that's definitely one event too many.
"I don't know whether there really will be 21, but I've heard the stories of a variety of new venues, from Russia to talk of New Jersey again," ESPNF1 quotes the McLaren team boss as saying.
"Well they're both important territories, aren't they, but whether all the other dates on the calendar survive, I don't know. But 21 is a lot of races, that's for sure."
He added: "We've had 19 this year and 20 last year, and I know it's only one more but we've been saying that since we had about 14 races and most of those were in Europe. It gets quite tough for the team."