Toro Rosso boss Franz Tost believes Carlos Sainz jr needs to gain more experience before he is handed a race seat in Formula One.
The 19-year-old son of former World Rally Champion Carlos Sainz has been mentioned as a possible replacement for Daniel Ricciardo at Toro Rosso next year.
Tosts confirmed that Sainz jr is in the running along with fellow Red Bull Junior Programme drivers Antonio Felix da Costa and Daniil Kvyat, but he feels the Spaniard is not yet ready to take the step up to F1.
"Sainz, Kvyat and Da Costa are the three candidates for the seat," Tost is quoted as saying by MARCA. "But I also believe that Carlos is missing two seasons [before he gets an F1 seat] as I do not believe you should get into Formula One before 20. Nor expect too much from them.
"Carlos has to continue competing in lower formulas, win, grow and then wait to make the leap."
He added: "I don't make the decision alone, but there are several people who will decide with is best for all. You can never say no to anything, but I don't think Carlos will run in 2014."