In June 2013, Mantovani was loaned to CD Leganés in the same division.[4] He appeared in 39 matches during the season, as the Madrid side returned to Segunda División after a ten-year absence, and subsequently signed permanently on 30 June 2014.[5]
On 5 October 2014, aged 30, Mantovani played his first match as a professional, starting in a 2–0 home win against CD Tenerife.[6] He scored his first goal late in the month, netting his side's only in a 1–1 away draw against CD Numancia.[7]
Mantovani appeared in 38 matches and scored two goals during the 2015–16 campaign, captaining his side in its first-ever promotion to La Liga. He made his debut in the category on 22 August 2016, starting in a 1–0 away win against Celta de Vigo.[8]
After five seasons at Leganés, Mantovani left the team and signed a two-year contract with UD Las Palmas as a free agent.[9] In March 2019, he joined SD Huesca on loan until the end of the season.[10]
On 5 October 2020, Mantovani terminated his contract with the Canarians.[11]
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