Kimi Raikkonen will race for Ferrari next season after agreeing a two-year deal that takes the 2007 Formula One World champion back to the glamour team he left in 2009.
Vettel, who won all four of his world championships with Red Bull, has gone 16 races without a victory and made some costly errors, while Hamilton has won 14 of the last 20.
An angry Leclerc dropped to fourth after Ferrari called him in again for slicks and then told him, too late, to stay out after Sainz also pitted and went directly from wets to the dry tyres.
The seven times Formula One champion says Ferrari cannot afford to fire any more blanks.
Lewis Hamilton stormed to pole position at the Brazilian Grand Prix on Saturday with Mercedes team mate and title rival Nico Rosberg joining the triple Formula One world champion on the front row. On a damp and overcast Sao Paulo afternoon, it was the 60th pole of the Briton's career, eight short of Michael Schumacher's record, and his first in Brazil since 2012 when he was at McLaren. With his title on the line, it was also one of Hamilton's most important in a roller-coaster season marked by mechanical setbacks.
Fresh from his 50th Formula One win, triple world champion Lewis Hamilton remains convinced anything is possible in the title race even if he could lose his crown as early as Sunday.
