Senna stalled on signing a full contract in the winter because he first wanted to drive the new McLaren in the heat of battle.
His dice with Alain Prost's Williams in the early part of the South African Grand Prix 10 days ago, and his runner-up result, was enough to encourage him to stay. But he is still driving only on a race-by-race basis.
Senna said yesterday he had signed a contract to race at Interlagos but he added that no agreement had been reached regarding the rest of the season.
The financially troubled March team have withdrawn from the world championship.
The wild saloons, page 38Reuse content