"The team didn't say anything so I thought I was shot, " said Hamilton, who became Britain's ninth world champion and the first since Damon Hill in 1996.
The pairing of Button and Hamilton at McLaren makes them the first team to have two British world champions since Graham Hill and Jim Clark were together at Lotus in 1968.
But even if Massa wins, Hamilton only needs to finish fifth for McLaren to become Britain's first world champion since Damon Hill in 1996 and the youngest ever in the history of the sport.