Nico Hulkenberg feels it is a "bit risky" for Sauber to fast-track Russian teenager Sergey Sirotkin.
Sirotkin, who turns 18 this coming Sunday, is expected to line-up on next year's grid as part of Sauber's new deal with a group of Russian backers.
The youngster has yet to put in a lap in a Formula One car but is scheduled to at least meet the team later this week when he heads to their Hinwil factory.
However, whether signing Sirotkin is a mistake or not, Hulkenberg, his potential 2014 team-mate, says it's not his call.
"Me, I wasn't ready for Formula 1 at that point," Hulkenberg told Autosport.
"It is ambitious, maybe a bit risky, but it's not my decision....
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