Ryan's first interview with the Bills was Thursday. He is the first known candidate that the team has brought back for a second interview.
The Bills already have interviewed 12 candidates for their head-coaching vacancy, which opened last week when Doug Marrone opted out of his contract. Buffalo has also requested initial interviews with two other candidates -- New England Patriots offensive coordinator Josh McDaniels and Indianapolis Colts offensive coordinator Pep Hamilton -- who have yet to meet with the team.
Ryan, 52, also has interviewed with the Atlanta Falcons. He also was scheduled to meet with executives this week at CBS about a possible broadcasting job, according to a report from the New York Daily News.
Ryan was fired last month after six seasons with the Jets. He finished with a 46-50 record.