They say they have evidence linking Mr Mazzaro, who is on the run from them, to Mr Migliore.
BBC: San Lorenzo keeper Pablo Migliore remains in jail
Migliore's lawyer, Matias Morla, reaffirmed his client's innocence and said he would wait until Wednesday to request his release.
Migliore, 31, was arrested when he came off the pitch on Sunday.
Mr Migliore, who played for Boca Juniors until 2008, is suspected of aiding Maximiliano Mazzaro, a member of a group of hardcore Boca Juniors fans.
Pablo Migliore has refused to testify and will remain in jail.
San Lorenzo Club President Matias Lammens said Mr Migliore had been surprised by his arrest just minutes after Sunday's game at San Lorenzo's Pedro Bidegain stadium against Newell's Old Boys.
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