Mercedes motorsport boss Toto Wolff has revealed the team may have to make 'an unpopular call' for their drivers in light of Ferrari's revival this season. Following the first three races of the new Formula One season it is clear Mercedes will not have it all their own way as Ferrari appear poised to push them all the way. Wolff's remark also comes in the wake of Nico Rosberg's moaning over the team radio during Sunday's Chinese Grand Prix about how slow team-mate Lewis Hamilton was driving. Toto Wolff (left) says Nico Rosberg (right) and Lewis Hamilton will have to deal with some 'unpopular calls'Toto Wolff says the Mercedes drivers may be unhappy with some callsLewis Hamilton and Nico Rosberg have fallen out after the Chinese GPFerrari are proving tough competition and Wolff says they must win
'It may be if we are risking a win against _ we would make an unpopular call, not to freeze everything, but manage them more,' Wolff said.