In what's become something of a spring tradition -- though this time with an early-bloom twist, the Cardinals have reached an agreement on a contract extension with one of their young players, giving him security and the team cost-certainty for years to come. Paul DeJong and the club are in the process of finalizing an extension with the team, two sources have confirmed. An announcement is expected later Monday. Details of the deal are not yet known. The team has declined comment. The Cardinals and DeJong spoke about an extension in the early days of spring training, and those talks continued even after an agreement was reached on his salary for the 2018 season. DeJong is not arbitration-eligible until after the 2020 season and he would not be a free agent until after 2023 season. That kind of control gives the Cardinals considerable leverage when it comes to signing a longterm deal, but it also offers a sense of the shape his extension could take.