Feb.29 (GMM) German duo Adrian Sutil and Timo Glock are facing make-or-break seasons in formula one this year, 1982 world champion Keke Rosberg has said.

The former Finnish driver, who in 2008 will attend all the races for German television, observes that the presence of veteran Giancarlo Fisichella in the sister Force India car will be a true test of the promise shown by 25-year-old Sutil in 2007.

"He will be measured against Fisichella, and he must clearly beat him, because he (Fisichella) is a discontinued model," Rosberg, 59, told Sport Bild.

Referring again to Sutil, he added: "If he fails, he will be in problems."

Rosberg also warned reigning GP2 champion Timo Glock to be wary of his Toyota teammate in 2008.

"He must be careful," he said. "Jarno Trulli is a very fast qualifier, and qualifying basically characterises the race results.

"Timo has to keep pace with Trulli, otherwise he too will have problems," Rosberg added.

Keke Rosberg, meanwhile, spoke glowingly about another German in the 2008 field; 20-year-old Sebastian Vettel, of Toro Rosso.

"In a very short time he has built a very good name," he said of the baby-faced racer.

"He is a man of the future," Rosberg added.