Jenson Button concedes he's going to need the help of the entire McLaren team, even team-mate Lewis Hamilton, if he wants to retain his World title.
Button clinched the crown last season racing for Brawn GP, but then shocked the F1 community when he left Brawn, now Mercedes GP, in favour of a race-seat with McLaren.
The Brit, though, faces tough competition for this year's title - and not all of it will come from outside his team.
His team-mate Lewis Hamilton, the man Button dethroned, is also vying for his second Championship, promising Formula One fans an intriguing intra-team battle at McLaren.
However, what makes it more interesting is that, at the end of the day, one of them may need the other to help them clinch the crown.
"In Formula One a driver cannot win the Championship by himself. Michael (Schumacher) and Fernando (Alonso) never would have won it by themselves," Button told Spain's Marca.
As for the challenges that could arise from outside his own team, Button reckons Alonso and perhaps even Schumacher could be his toughest competition.
"I see Alonso is very happy and that is bad because he is fast," he said. "We will see if Schumi still has what it takes."
