Todt: Calendar Plays Against Ferrari

"It is already very tough for everybody in the team when we have back to back races," Todt told a news conference ahead of Sunday's French Grand Prix.

July will be the season's busiest month in Formula One with four races in five weeks.

The French Grand Prix will be followed by next week's British GP at Silverstone before the circus heads to Germany on July 24 and Hungary a week later.

Todt said there was not enough room between the races for the teams to work properly on their settings.

"This a great disadvantage for us compared to better teams because we just have little time to react," he said.

This year is the longest in Formula One history with 19 races on schedule. Next season should count 20 Grands Prix.

Ferrari are third in the constructors' standings with 63 points, 13 behind leaders Renault.

Renault's Spanish driver Fernando Alonso leads the drivers' standings on 59 points, 25 ahead of Ferrari's seven-times World Champion Michael Schumacher with 10 races remaining.