[3][4] A move to Primera B Nacional club Ferro Carril Oeste followed and he made his league debut on 5 May 2010 in a 0–1 win versus Quilmes.
[1] Later in 2010, Pellegrino spent a season on loan at Argentine Primera División team Gimnasia y Esgrima but didn't play a match.
He went on to play ninety league matches for Defensa y Justicia in three seasons, including nineteen in the Primera División after the club won promotion in 2013–14.
[7] He featured five times across the following season, with his 200th career appearance arriving on 15 March 2020 during a Copa de la Superliga defeat to Talleres.
[1] After a spell at Mitre, Pellegrino moved to Spain where he in July 2021 signed a one-year deal with Segunda División B side CD Tudelano.