Red Bull driver Coulthard said Schumacher, 38, who last raced at the Brazilian Grand Prix in October 2006, could return to dominate Formula One again, if he wanted to step out of retirement.
Especially if he chose to fill the gap at McClaren recently vacated by twice world champ Fernando Alonso as the British-based team look for a driver to partner Lewis Hamilton.
“No-one should doubt Michael’s quality for a moment, he hasn’t lost anything,” Coulthard told German tabloid Bild.
“He could make a return to Formula One anytime he wants.
“If McLaren needs another driver - Michael would be a fantastic solution.”
Schumacher blazed around the Circuit de Catalunya in Spain and fellow Ferrari test driver Luca Badoer watched in wonder.
“It is unbelievable what Michael can still do,” said Badoer.
“It barely looks like he has spent a day away from the track, let alone a year.
“He is definitely the fastest driver of the world.”
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