Continuing the uncertainty of Saturday's post-qualifying period, the FIA has issued a revised grid line-up for the Malaysian Grand Prix in an effort to clarify who starts where following the raft of engine changes to have taken place this weekend.

The biggest alteration concerns seven-time world champion Michael Schumacher, who took a ten-place penalty after Ferrari opted to change his engine between Saturday practice and qualifying. Having then qualified fourth, the German was expected to line up 14th on the Sepang grid - except for the fact that three drivers who would have been ahead of him also had ten-place penalties hanging over them.

Most expected the removal of David Coulthard, Rubens Barrichello and Schumacher's brother Ralf to the back of the field to elevate the Ferrari man back up to eleventh, but the FIA has since clarified that he will hold on to 14th, with those effectively behind him on the original thinking now pushed in front. Ferrari acknowledged such a scenario in a revised post-qualifying release on Saturday evening, but the governing body waited until race day to issue its own clarification.

The biggest beneficiaries of Schumacher's 'demotion' are Nick Heidfeld, Scott Speed and Tonio Liuzzi, who all gain one place.

One other anomaly to have crept in to the revised line-up, however, concerns Schumacher's team-mate, Felipe Massa, and brother Ralf, with the younger German now finding himself 22nd and last, despite the fact that Massa has apparently changed engines twice since Bahrain and should be the victim of a 20-place penalty.

While there have been no reported engine changes since qualifying session, any team deciding not to risk its V8 - or V10 in Toro Rosso's case - could cause more head-scratching before the race gets underway.