The phone rang on a Friday in July 2005 at Saez Peña's family home. Jonas had not arrived from his morning training at the Vélez Sarsfield club. Monica, his mother picks up the phone, and at the moment Mr. Raúl Gámez informs him that Jonah must take the plane to Palma de Mallorca that same night in order to fix his contract with the club of that city.
The contract lasted for three years.
Jonás disputó con el RCD Mallorca tres Ligas Españolas.
Jonas made a total of 7 goals, 5 in the League and 3 in the Copa del Rey. He put on the Spider-Man's mask for the first time when marking A goal to Osasuna.