Mercedes AMG Petronas boss Toto Wolff believes the team may have to restructure in order to cope with the demanding 2016 Formula One calendar.
The number of races has been increased from 19 to 21, with the brand new Grand Prix of Europe at Azerbaijan's Baku City Circuit added to the schedule and the German GP at the Hockenheimring making a return.
"It's definitely a lot for the traveling team. Nineteen races already was a lot this year and next year back-to-back races are quite difficult,” Wolff told F1i.com.
"We need to have a look at the organisation – everyone is getting pretty tired at the end of the season – and I am not sure we can actually cope with 21 races in the current structure," Wolff concluded.
"We have to be looking at maybe having second shifts, rest times after the race weekends. It's quite a complex thing to do for next year."
The season will also have six back to back weekends, including six races between 12 June and 31 July.