Joaquin "El Chapo" Guzman, the head of Mexico's Sinaloa Cartel, being escorted to a helicopter in Mexico City following his capture in the beach resort town of Mazatlan. File picture: Eduardo Verdugo/AP

New York - Defense attorneys asked a federal judge Tuesday to grant a new trial to the Mexican drug lord known as El Chapo, saying jurors improperly followed media coverage of the sensational drug conspiracy case.

Joaquin Guzman's defence team said in court filings that jurors repeatedly disregarded instructions to avoid the "blizzard of media coverage" before convicting Guzman of murder conspiracy and drug-trafficking charges last month.

The defence asked US District Judge Brian Cogan to hold an evidentiary hearing in the wake of a Vice News report that said at least five jurors followed media reports and Twitter feeds during the three-month trial. The attorneys said juror misconduct denied Guzman his right to a fair trial.

"If a justice system's measure is how it treats the most reviled and unpopular, then ours may have failed Joaquin Guzman by denying him the fair trial before an untainted jury to which he's constitutionally entitled," Guzman's attorneys wrote in a court filing. "Because sunlight is the best disinfectant, that prospect merits serious consideration, close investigation and a new trial as appropriate."

A spokesman for the US attorney's office in Brooklyn declined to comment.

The defence motion claims that jurors "actively sought out and openly discussed" sensational allegations that had been excluded from Guzman's proceedings, including a claim by a government witness that Guzman raped girls. The government did not charge Guzman with rape.

The defence team also accused jurors of "cannily lying" to the judge when he asked them about their exposure to media coverage.

Guzman faces life in prison at his June sentencing.

AP