 Complete the following phrase:  Di Grassi was announced as one of two drivers of the brand new Virgin Racing team on 15 December 2009 and would be partnered by his former GP2 Series rival Timo Glock in a deal predicted by BBC Radio Sheffield. An important factor in his decision was the chance to work with John Booth, the Virgin team principal. It was reported by The Daily Telegraph that di Grassi had also provided Virgin with 5 million worth of sponsorship. Writing in The Guardians 2010 Formula One supplement, Alan Henry and Rob Bagchi predicted that Glock would outperform di Grassi throughout the season. He retired from the opening two rounds of the season 