Sauber face a contract row with their driver, Adrian Sutil, after dropping him from the team for 2015.
The German had previously said he already signed a contract for next season, before Sauber’s recent signing of Marcus Ericsson and Felipe Nasr.
“They’ve confirmed two drivers but that doesn’t mean they can drive and it doesn’t mean the team’s going to drive,” he told BBC Sport.
Sauber’s team boss, Monisha Kaltenborn, meanwhile insists she knows what she’s doing and that she’s very aware of the situation ahead.
“You have to look at the overall situation in Formula 1, which is very challenging,” she said.
“When private teams make decisions they have to take financial aspects into consideration, otherwise it gets very difficult to survive. That’s the situation, but it’s now different for us. This is a step in the right direction.”
Sutil is in his seventh season in Formula 1, with a best finish of fourth in the 2009 Italian Grand Prix. He has yet to score a point, with a best finish of 11th.
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