Timo Glock has revealed he is expecting a "quick recovery" from a sudden bout of appendicitis.
Virgin boss John Booth revealed on Tuesday that the team's German driver was only expected to stay another 24 hours in a Swiss hospital following "routine" surgery.
"To ensure a swift recovery, it is unlikely that he will take part in next week's test in Barcelona and that Jerome (d'Ambrosio) will run on all four days instead," said Booth.
Glock, 28, commented from hospital that he is "very happy" with the success of the operation "and about my quick recovery".
"It's a shame that I'll probably miss the tests in Barcelona," he said, although he was sure he would be fit for the season opener in Melbourne later this month.
"Without an appendix I'm certain to be faster -V I mean, it must have weighed a few grams at least!" he joked.
Booth admitted it is possible Glock will be well enough to drive in Barcelona, with Virgin's programme kicking off next Tuesday.
"We will make a final decision early next week," he said. "We look forward to having Timo back with us very soon."