Clemens spent the past four seasons with the Chargers. In 12 seasons, he has played 64 games and started 21. Clemens, 34, has an 8-13 record with a 54.9 completion percentage, 4,053 yards with 16 touchdowns and 21 interceptions.
Davis, 28, has played 16 games with 10 starts. He has a 3-7 record with a 62.4 completion percentage, 2,548 yards with 13 touchdowns and 12 interceptions.
Davis spent last season with Seattle, and starter Russell Wilson is the only quarterback on their roster after the Seahawks cut Trevone Boykin.