Despite elder brother Michael's advice to the contrary, it appears that F1 refugee Ralf Schumacher may be considering a switch to the German touring car series DTM in 2008.

According to ORF, the Austrian national broadcaster, the 32-year-old has lined up a test in a Mercedes-Benz tin-top car this week.

Christian Klien, who similarly tested for Force India earlier this winter before the team selected Giancarlo Fisichella for 2008, may also attend the test, the report added.

Following former twice world champion Mika Hakkinen's departure as a works Mercedes-Benz DTM racer, it has been suggested that the manufacturer and the series were keen to tie up again with another F1 name.

ORF said Schumacher, a six-time grand prix winner, and Austria's Klien will test on Tuesday and Wednesday at Estoril, Portugal.