Jean-Eric Vergne is set to start the Japanese Grand Prix from 21st place after receiving a grid penalty for using a sixth power unit component.

Having originally qualified 11th, it transpired that Vergne had required a new internal combustion engine (ICE) for qualifying and as a result is handed an automatic 10-place grid penalty under the 2014 regulations. That would drop Vergne to 21st place, a position Toro Rosso expects him to occupy although the FIA's provisional grid has Vergne starting 20th ahead of Max Chilton and Pastor Maldonado.

If a driver can't take the full drop of 10 positions at one race, the penalty carries over to the following race and Toro Rosso's deputy technical director Ben Waterhouse said that had been part of the focus of qualifying.

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"The most important thing is that he managed to qualify above P12 and so he takes all his penalty here, with none of it carried over to Russia next weekend," Waterhouse said.

It's a further disappointment for Vergne who was overlooked for a Red Bull drive for the second year in succession on Saturday, with Daniil Kvyat being promoted to replace Sebastian Vettel.