 Complete the following phrase:  With Alain Prost, Ayrton Senna and Nigel Mansell all desperately trying to sign for Williams, Patreses position looked to be under threat and he signed for the Benetton team before the end of the year. His teammate for would be young German driver Michael Schumacher. Ironically, only Prost was able to agree terms with Williams for 1993 Mansell went on to race in the American-based Champ Car series while Prost had a clause in his contract, signed in early 1992, that prevented Senna from being his teammate. This would have left a seat free for Patrese had he remained with the team. Although Williams offered Patrese the opportunity to stay with the team after Mansell announced his retirement from F1 at the 