"Sebastian Vettel is staying until 2015 and so it's probably not the best time to become his teammate" - Eddie Jordan
Tost sees "no reason" why Red Bull shouldn't choose 23-year-old Ricciardo
Tost insists the pressure on Ricciardo will be higher than it was for the then 21-year-old Vettel.
Daniel Ricciardo topped the times at the Silverstone test.
Mercedes swept the day in Sepang.
By Berthold Bouman, F1 Correspondent