Michael Schumacher could lose the points he won for finishing first in Sunday's Austrian Grand Prix after team-mate Rubens Barrichello was ordered to slow yards before the line.

The Ferrari team orders sparked a wave of protest worldwide and the drivers and officials from the Italian constructor have been summoned to appear before the International Automobile Federation (FIA) on 26 June.

Brazilian Barrichello had led for much of the race at the A-1 ring at Zeltweg but was ordered to make way for championship leader Schumacher to take the chequered flag.

Technically, Ferrari did not break any rules but sources close to the FIA believe the incident was against the spirit of competition.

An FIA statement said: "Following an incident during the last lap of the 2002 Austrian Grand Prix .... the FIA has summoned the Scuderia Ferrari Marlboro and the drivers Michael Schumacher and Rubens Barrichello to appear before the World Motor Sports."

But the FIA are also up in arms with Schumacher for pushing Barrichello onto the top of the podium and handing him the trophy, in clear contravention of the governing body's procedure.

Penalties available to the FIA include docking Schumacher's points or banning both drivers from a race or future races.

In 1997, the FIA removed the European Grand Prix from Jerez after the Mayor of the town upstaged the podium ceremony which saw Jacques Villeneuve crowned world champion after Schumacher unsuccessfully tried to force him off the track.

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Schumacher later said he took "no joy" from the result in Austria, although the victory extended his lead in the drivers' championship to 27 points.

The most similar recent example of a driver giving away victory came at the Australian Grand Prix in 1998, when David Coulthard pulled over to hand Mika Hakkinen victory in the final straight.

But it was not the result of team orders, rather an agreement between the drivers that whoever was in the lead after the first corner could pass at the end to win.