Pirelli signs test drivers Alguersuari and di Grassi
The former Toro Rosso driver was left without a role for the 2012 season, so he signed on as a co-commentator for British radio as a means of staying in the paddock full-time.
The 22-year-old Spaniard will join Pirelli's existing test driver Lucas di Grassi, the former Virgin driver, and the pair will also develop tires for GP2.
Pirelli said Alguersuari will "bring his knowledge of the most current generation of formula one machinery".
He and di Grassi will test Pirelli's newly-acquired 2010 Renault car at Jerez, Spa, Monza and Barcelona between May and September.
"I have a huge desire to get behind the wheel of a formula one car again and return to competition, so this is a brilliant chance for me," said Alguersuari.