This comes after ESPN's Adam Schefter reported on April 13 the Seahawks postponed a Kaepernick workout because the Nevada product wouldn't commit to no longer kneeling during the national anthem in protest of racial injustice and police brutality.
Kaepernick filed a lawsuit against the league and its owners alleging collusion to keep him off a team after he wasn't signed during the 2017 campaign following his decision to kneel during the anthem.
Carroll's comments also come after Mike Garafolo of NFL Network reported on April 16 talks between the Seahawks and Kaepernick are "in a holding pattern but not done" after they re-signed backup Austin Davis.
According to Schefter, there hasn't been a single team to officially work out Kaepernick since his free agency started following the 2016 season even though Seattle and the Baltimore Ravens considered it.
The Seahawks are set at starting quarterback with Russell Wilson, but Davis and Stephen Morris behind him don't have the established pedigree Kaepernick built during his time with San Francisco.
Kaepernick led the 49ers to the 2012 season's Super Bowl and 2013 season's NFC Championship Game in back-to-back years as a dual-threat quarterback who consistently hurt opposing defenses with his arm and legs. He also played 12 games in 2016 and threw for 16 touchdowns to just four interceptions.
Despite not playing in the NFL last season, Kaepernick is still just 30 years old.