De la Rosa puts his McLaren car to the test in Spain
McLaren's Formula One test driver Pedro De la Rosa says the ban on in-season testing could prove to be dangerous.
New measures were brought in by the FIA, the sport's governing body, as part of cost-cutting measures for F1.
With Barcelona hosting the last testing session ahead of the season-opener in Australia on 29 March, De la Rosa is worried if reserve drivers are needed.
"We could be a problem, with regard to safety, if we haven't driven enough," he said after testing in Jerez, Spain.
Teams are currently preparing for the new season, which opens with the Australian Grand Prix in Melbourne at the end of March.
The FIA opted for the new ban in December last year and it could lead to F1 team's test drivers becoming redundant for the rest of the year.
The 38-year-old Spaniard added: "I'm hoping I can test again in the next few weeks because to me it's very important to arrive in Melbourne with as many miles as possible.
"Otherwise, the situation for a reserve driver is ridiculous.
"Arriving in Melbourne with very little mileage done, or not having a single day of testing during the season, makes the test driver rusty in case we have to climb into the car."