Nico Rosberg's situation "will only get worse" if he remains at Mercedes, according to Felipe Massa.

Felipe Massa believes Nico Rosberg will have to quit Mercedes to fulfil his ambition of being crowned Formula One world champion.

The 30-year-old German has endured more frustration in his quest to win his maiden F1 title, with team-mate Lewis Hamilton ruling the roost once again.

Rosberg accused Hamilton of driving into him when the pair made contact at turn one in the United States Grand Prix last weekend and threw his hat at the Brit after he won in Austin to claim his third world title.

Massa knows all about playing second fiddle to a team-mate from his time at Ferrari, when he and Fernando Alonso had their moments.

Williams driver Massa thinks Rosberg will be in for more disappointment if he opts to remains with the constructors' champions.

He told Brazilian media. "I believe that Nico's situation will only get worse next year because Lewis keeps winning,

"He is also 'winning' the team for him. I think Nico's only hope is to change teams so he can start fresh all over again."