Miguel Isaías Jacquet Duarte (born 20 May 1995) is a Paraguayan professional footballer who plays as a centre-back for Libertad.

[2] He appeared for his professional debut in April 2014, featuring for the full duration of a four-goal victory away to Guaraní in the Paraguayan Primera División.

[2] In the 2017 campaign, Jacquet played forty times across the Primera División and the Copa Sudamericana; netting four goals in the process, including against Guaraní in the league and versus Estudiantes on the continent.

[2] During his time with Nacional, Jacquet was linked with moves away to Universidad de Concepción, Gimnasia y Esgrima and KV Mechelen.

[3] On 29 July 2019, after one hundred and forty-two matches for Nacional, Jacquet departed to Argentine Primera División side Godoy Cruz.