SiriusXM's Adam Caplan broke the story, which was then reported by multiple media outlets.
Albert initially announced his retirement on July 31 following three practices in training camp. He would owe Jacksonville $3.4 million in signing-bonus money if he stayed retired. He also is subject to fines of up to $40,000 per day for the time he was not with the team, according to NFL.com.
The Jaguars acquired Albert from the Miami Dolphins for a 2018 seventh-round pick in March. The Dolphins likely would have released Albert before Jacksonville showed interest in acquiring him.
Immediately after being obtained by the Jaguars, Albert requested a new contract, but the team declined to rework his pact, and the 32-year-old skipped offseason workouts.
Once training camp began, Albert was competing with rookie Cam Robinson for the starting left tackle positon. Albert worked with the first-team offense on the first day of camp, but Robinson practiced with the first-team offense in the next two practices.
Albert is under contract through the 2018 season. The Jaguars are slated to pay Albert $8.9 million this season and $9.6 million next season, though none of the money is guaranteed.
Albert is a two-time Pro Bowler (2013 and 2015) and has started 118 games in nine seasons with the Kansas City Chiefs and Dolphins. He has missed 20 games in the last five seasons, including four last year.