 Complete the following phrase:  With Vettel moving to Red Bull Racing replacing the retired David Coulthard, Sébastien Buemi and Sébastien Bourdais led the teams assault in the 2009 World Championship. After the previous years success, several drivers wanted to drive for Toro Rosso, including Takuma Sato who even did three tests with the team and Bruno Senna. Toro Rosso unveiled their new car last of all the teams taking part in the 2009 season, on 9 March 2009. Before the season started, the teams boss Franz Tost said that it would be difficult to do as well as they did in the season. On 16 July 2009, the team announced that Sébastien Bourdais contract was to be terminated with immediate effect due to disappointing results. On 20 July 2009, the team announced that Jaime Alguersuari would replace him as official driver for the rest of the season. Multiple WRC Champion Sébastien Loeb had been quoted in the French sports-paper LEquipe as being interested in replacing Bourdais. It had been stated that Loeb would not be available to race in F1 until after the end of the WRC season. He wouldve been available to make his F1 début at the 