MEXICO CITY, Nov 3 (Reuters) - Mexico's attorney general sought an arrest warrant for former Foreign Minister Luis Videgaray in a case involving scandal-plagued Brazil construction firm Odebrecht, but was blocked by a judge, President Andres Manuel Lopez Obrador said on Tuesday.

Videgaray and other high-ranking politicians under Lopez Obrador's predecessor were accused of corruption in the deposition, leaked in August, of a former chief executive officer of Mexican national oil company Petroleos Mexicanos.

The deposition, whose authenticity is not in dispute, alleges they used bribes from Odebrecht to finance political campaigns and influence lawmakers to support a reform of Mexico's jealously guarded energy sector.

"I have been informed that a request of this nature was made to the judiciary, but the request was rejected," Lopez Obrador said in a regular news conference. "My understanding is that the judge sent the request back to the attorney general's office."

He said he did not know if a new warrant could be requested.

The Attorney General's office said in a statement it had not received a rejection letter regarding the arrest warrant.

Mexican news outlet Latinus first reported on the matter.

Neither the attorney general nor Videgaray immediately responded to requests for comment. Videgaray has previously denied wrongdoing in the case.

Former Odebrecht executives have testified about bribes made to Emilio Lozoya, the former Pemex CEO.

Videgaray was the campaign manager of former President Enrique Pena Nieto, Lopez Obrador's predecessor.

He initially served as Pena Nieto's finance minister and, in 2017, became foreign minister for the remainder of the administration, which ended on Nov. 30, 2018.