Jaime Alguersuari on Thursday admitted he is not sure about his future in Formula One.
Red Bull's driver manager Dr Helmut Marko this week refused to rule out stepping down a Toro Rosso racer before the end of the season to make room for promising Australian Daniel Ricciardo's debut.
Spaniard Alguersuari is regarded as the Toro Rosso driver most under pressure at present, given his recent performances with the Red Bull junior team.
"Alguersuari at the moment has major problems with the tyres," Marko said on Austrian television Servus TV. "It is happening both in qualifying and in the race.
"We will look at the situation and find an appropriate solution," he added.
As for whether a premature end to a Toro Rosso driver's season is possible in 2011, Marko admitted: "In Formula One you can't exclude."
Asked about his future in Valencia on Thursday, 21-year-old Alguersuari admitted he wasn't sure.
"I don't know about the situation on the future, I always try to do the best, I try to enjoy because it is my job and if I don't enjoy my job I would not be here," said the Spaniard.