Sauber has confirmed it will not remain in Barcelona to participate in the two-day in-season test as it doesn't have a 'young' driver able to assist.
Following on from the Spanish Grand Prix, the teams will remain at the Circuit de Catalunya for two days of testing, which must include a 'young' or reserve driver as part of the line-up.
However, with no signed reserve driver to call upon, Sauber says it will skip the test and turn its attentions to the following round in Monaco.
The news comes as Sauber continues to battle against known financial difficulties, with reports that it is falling behind on salaries being paid. Neither Marcus Ericsson nor Felipe Nasr have scored a point in the opening four rounds.