Marciello joins Sauber as test and reserve driver

Ferrari protege Raffaele Marciello has joined Sauber as test and reserve driver for the 2015 season, the Swiss team announced on Wednesday.

Marciello, 20, already has prior experience of Formula One machinery, having tested for Ferrari in Abu Dhabi in November. He will combine his new Sauber duties with a second full season in GP2, in which he won once and claimed four podiums en route to eighth in the 2014 championship