Sauber is set to part company with reserve driver Robin Frijns after the Dutchman was informed that his services will not be required in 2014.
Frijns, reigning Formula Renault 3.5 Series champion, joined Sauber at the end of last season.
“Yes the bad news is true…” Frijns posted on his Twitter account on Wednesday evening.
“I don’t know what happens now,” Frijns added to Autosport.
“All I know is I’m sitting at home and everybody is in Monza. I’m a free agent. I don’t blame Sauber, they have to keep themselves alive as a team and I understand that.
“Of course they have a great history with young drivers and giving them a chance in Formula 1.”
“But they also have a financial situation that everyone knows about, and that is something that is out of my hands.”
Frijns has taken part in selected rounds of the GP2 championship this season and won the feature race in Barcelona.
Sauber does not have a simulator, which means that Frijns’s only action with the Swiss team came during the young driver test at Silverstone in July, where the Dutchman sampled the C32.
Sauber is preparing Russian teenager Sergey Sirotkin for his Formula 1 debut, which could happen in 2014.