Michael Schumacher "not satisfied" with Formula 1 comeback

Michael Schumacher has insisted that he is "not satisfied" with his performance since his return to Formula 1.

The driver, who has won seven world titles, achieved his sole podium finish since his return to the sport at last month's European Grand Prix. However, the 43-year-old insists that he still strives for success.

Schumacher told Sport Bild: "I have achieved very little in the second part [of my career].