Sauber has confirmed it will receive an upgraded power unit from Ferrari for the Spanish Grand Prix as it looks to ignite its 2016 campaign after difficult opening rounds.

The Swiss team has failed to score a single point after four rounds of the 2016 F1 world championship which is mostly down to falling behind on the development of its C35 challenger.

Sauber were forced to run last year's car at the first four-day winter test at Barcelona before debuting the C35 at the second test and has been playing catch-up over the opening four races.

Sauber has also been forced to delay payment of wages to some of its staff due to financial issues, while the team will skip the first in-season F1 test at the Circuit de Catalunya as it does not have a young or test driver on its books.

However, the team is hoping for an upturn in its fortunes with the arrival of updated Ferrari engines for Marcus Ericsson and Felipe Nasr which will debut at the Spanish Grand Prix this weekend.