The father of a pupil accused of launching an online campaign against Samuel Paty, the teacher beheaded in France, sent messages to the killer before the attack, French media report.
Mr Paty, who was killed on Friday, had earlier shown controversial cartoons of the Prophet Muhammad to his pupils.
The 48-year-old father, who has not been officially named, is accused of issuing a "fatwa" against the teacher.
The brutal murder of Mr Paty, 47, has shocked France.
Tens of thousands of people took part in rallies across the country on Sunday to honour him and defend freedom of speech.
A man named as 18-year-old Abdoulakh A was shot dead by police after killing Mr Paty on Friday.
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The father of the pupil is reported to have exchanged a number of text messages with Mr Paty's killer prior to the attack close to the teacher's school in Conflans-Sainte-Honorine, a north-western suburb of Paris.
He is accused, along with a preacher described by French media as a radical Islamist, of calling for Mr Paty to be punished by issuing a so-called "fatwa" (considered a legal ruling by Islamic scholars).
Interior Minister Gérald Darmanin said the two men have been arrested and are being investigated for an "assassination in connection with a terrorist enterprise", French media report.
Police launched a series of raids targeting Islamist networks on Monday, and some 40 homes were targeted. More raids are expected and President Emmanuel Macron is due to chair a meeting on Tuesday to review the police operation.
Meanwhile, Mr Darmanin said 51 French Muslim organisations, including charities and NGOs, would be inspected by government officials and closed down if they were found to be promoting hatred.
So far, a total of 16 people have been taken into custody in the aftermath of the murder.
The killer's grandfather, parents and 17-year-old brother were detained shortly after the gruesome attack. Four school students have been detained as well.
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