Romain Grosjean admits he doesn't know why only Kimi Raikkonen has been confirmed as staying with Lotus for 2013.

Raikkonen's contract extension was announced the day after the Indian Grand Prix, but no comment was given on Grosjean's future. When asked if it was because Raikkonen could command enough publicity on his own, Grosjean admitted he was unsure why his own seat has yet to be decided.

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