The fates of former champions Sebastian Vettel, Fernando Alonso and Jenson Button remain in doubt with the Formula One season nearly over and teams holding off on announcing their lineups for 2015.

Speculation about driver moves are not uncommon late in the season, but this time two of the series' greatest stars and some of its biggest teams are involved in the rumors, igniting doubts over much of the grid.

Four-time champion Vettel is leaving Red Bull but hasn't said where he's going, two-time champ Alonso is undecided about whether he will stay at Ferrari, and one-time champ Button still hasn't been told whether he will keep his place at McLaren.

The other drivers yet to secure a seat for next year can only wait.