Sauber will sit out the first in-season test of the 2016 season after next weekend's Spanish Grand Prix.
The Swiss team, openly struggling financially this year, said that one reason for the decision is because they "will not introduce a car update" in Barcelona.
Secondly, according to a Sauber update on Twitter, "We do not have a young test driver available that fulfils the requirements."
Formula 1 rules say that at least two of the four days must be dedicated to young driver testing.
Apart from the post-Spanish GP test in Barcelona, there will only be one more in-season test in 2016, following the British Grand Prix in July.
