On 7 August 2020, after a season back in the third tier with Acassuso, Bartolo joined Superleague Greece outfit Volos on a free transfer.[3] He scored his first goal in stoppage time of a 1–1 draw away to Panathinaikos on 24 October.[8] On 30 November, Bartolo scored in a 3–3 away draw against Apollon Smyrnis; his side were three goals down early in the second half, with the midfielder netting the second and assisting the equaliser for fellow Argentine player Rodrigo Colombo, having been substituted on at 3–1 in place of other compatriot Nicolás Martínez.[4][9]
In the first two games of the 2021–22 season, Bartolo scored helping to wins against Lamia[10] and Apollon Smyrnis[11] and a perfect start, which found his team on top of the league table. On 17 October 2021, Bartolo scored a goal and assisted Tom van Weert in a spectacular 4–4 away draw against PAOK, despite his team being down by three goals in the first half.[12]
Asteras Tripolis
On 1 July 2022, Bartolo signed a three-year contract with Asteras Tripolis, also in the top tier.[13] His debut season for the club was difficult, scoring only two goals in 23 games.
He started the 2023–24 season scoring in two consecutive games, a 3–0 home win against OFI[14] and a 3–2 away win against Aris,[15] and assisting another one in his team's first away win over Volos.[16]