Michael Schumacher.

THE ASSOCIATED PRESS

FRANKFURT, Germany -- Seven-time champion Michael Schumacher may extend his Formula One comeback beyond the current three-year contract he has signed with Mercedes.

Though he will be 44 years old when the deal expires, the seven-time world champion told Bild newspaper in Germany that it may not signal the end of his F1 career.

"It doesn't have to be the end after three years," Schumacher told Wednesday's edition of the newspaper.

The three-year contract was Mercedes' idea and it was a sign of confidence, Schumacher said.

Schumacher said he was "sure" he would be competitive, although it might be a "a little optimistic" to win the title in his first comeback season.

"But that has to be out target and our motivation," he said.

Schumacher, who won five titles with Ferrari, said the Italian team will always remain in his heart.

"I have to watch out not to drive into the red (Ferrari) box when I change tires," Schumacher joked.