GREEN BAY, Wis. -- Preston Smith helped extend his career with the Green Bay Packers, and the team picked up much needed salary-cap space when they came to an agreement on a new contract Monday.

Meanwhile, Za'Darius Smith, the pass-rusher who signed in Green Bay in the same 2019 free-agent class as Preston Smith, saw his time with the Packers end on Monday. The Packers are releasing him, sources told ESPN.

Preston Smith, who had one year and $12.5 million left on his existing deal, signed a four-year, $52.5 million extension, a source told ESPN. Smith will make $25 million over the next two seasons with the chance to earn $31 million with incentives. The entire deal could earn Smith up to $71 million over five seasons should he reach all of the incentives.

The release of Za'Darius Smith saves the Packers $15.75 million in salary-cap space.

Preston Smith was scheduled to count $19.5 million on this year's cap. The Packers were $45.5 million over their salary cap before Smith's deal, which is expected to lower his cap charge by about $8-9 million. Quarterback Aaron Rodgers' contract extension, when it's done, also will lower the Packers' cap number.

The Packers are also releasing offensive tackle Billy Turner, a source told ESPN. That move will save them $3.142 million in cap space immediately or $5.8 million if they designate him a post-June 1 release.

The Packers must be under the cap by 4 p.m. ET Wednesday, when the 2022 league year begins.

Preston Smith teamed with Rashan Gary to form a strong pass-rushing duo last season while Za'Darius Smith missed most of the year because of a back injury. Preston Smith took a pay cut last offseason following a substandard 2021 season but bounced back with nine sacks.

In seven seasons, he has 49.5 sacks and has missed only one game. He originally signed a four-year, $52 million deal with the Packers in 2019.

Za'Darius Smith, who was named to the Pro Bowl in each of his first two seasons with the Packers (2019 and 2020) and was a second-team All-Pro in 2020, played only 18 snaps last year in the regular season. All came in the season opener before he underwent back surgery. He did not return until the NFC divisional playoff game, a loss to the San Francisco 49ers.

Last offseason, he made attempts to secure a contract extension with the Packers, even changing agents in May. However, he dealt with a back injury that kept him out of offseason practices and most of training camp.

Za'Darius Smith was the highest-priced free agent ever signed by general manager Brian Gutekunst, who gave him a four-year, $66 million deal. He lived up to it early on, posting the most sacks (26) by a player in his first two seasons with the Packers. He was one of only three players in the NFL with 12-plus sacks in 2019 and 2020, joining Aaron Donald and T.J. Watt.

Also currently on the Packers' cap is receiver Davante Adams' $20.145 million franchise tag. Neither the Packers nor Adams want him to play under the tag this season. It would provide Adams no long-term security and would be hard for the team to handle on their cap. While there has been little progress in negotiations, Gutekunst said using the tag is "more of a bridge to hopefully an extension down the road." They will have until 4 p.m. ET on July 15 to work out an extension.