The Chicago Bears spent the off-season loading to end a series of losing seasons. They have just made their biggest move.

The bears have taken over rider Khalil Mack from the Raiders from the Raiders in a massive trade that sends two first round pulls to Oakland.

Mack kept the entire off-season and preseason full and was looking for a new long-term contract instead of playing in the last year of his rookie deal, earning $ 13.8 million. Raiders coach Jon Gruden, in his biggest move since returning to the sidelines of the broadcast stall, housed the 27-year-old Mack on Saturday.

Oakland will receive first-belt selections in 2019 and 2020, a sixth rounder next year and a third rounder in 2020. Oakland also included the second-round selection in 2020 and a conditional fifth rounder that year.

Mack and the Bears agreed with an extension of six years, $ 141 million that guarantees $ 90 million. That makes him the best paid defender in the history of the competition one day after the defense of the Rams. Aaron Donald, the 2017 Defensive Player of the Year, signed a $ 135 million deal with $ 135 million, guaranteed for six years.

ESPN first reported the trade.

The fifth overall selection in the 2014 design, Mack is a dual All-Pro and the 2016 NFL Defensive Player of the Year. Mack played in each game for Oakland for the past four seasons, with 231 primary tackles, 40 1/2 bags and nine forced fumbles.

"We are delighted to add a special playmaker like Khalil to our football team," said Bears general manager Ryan Pace in a statement. "He gives a lot of money on the field, but he fits exactly what we build in our locker room Elite defensive players at their peak are rare, so when we knew we had a legitimate chance to buy it, we did everything we did thought necessary to get him. & # 39;

Since entering the league, Mack leads all players with 185 1/2 quarterback pressure and is in second place with 68 tackles for loss, according to SportRadar. He is one of the most versatile defenders in the NFL.

Simply put, he is a game changer.

The movement caused shock waves in the competition.

Raiders quarterback Derek Carr tweeted "No way" and added: "RaiderNation we feel your pain trust me, but we need you next Monday!" Oakland linebacker Bruce Irvin made his feelings clear with a profane post. Later he wrote: "What a shock, go on now and win … time to beat the rams !!"

Mack had been a cornerstone in Oakland along with Carr since its foundation and helped the Raiders end a 13-year-old playoff drought in 2016. But he never formed a relationship with Gruden, who had said that the ability to coach Mack was one of the reasons he was attracted to the job.

Gruden had named Mack Oakland's best player, but decided to go in a different direction than to give another player a contract of more than $ 20 million a year after Carr had a lucrative expansion last summer.

The Raiders invested heavily in the passtroming in the design, in which they P.J. Hall and Maurice Hurst approached and Arden Key ended up hoping to bring them together with Mack and Irvin. The three rookies showed promise in the preseason, but they will never get the chance to play with Mack.

Oakland hosts the Rams on 10 September. Chicago opens on September 9 in a prime time game against Green Bay.

An excited Bears tackle left Charles Leno Jr. tweeted a video in which he danced on the Return of the Mack & # 39; from Mark Morrison.

A triple Pro Bowl pick, Mack is also the best pass rusher the Bears have taken over since they left Julius Peppers from Carolina with a six-year deal in 2010.

The Bears exchanged two first-round picks for the last time when they acquired quarterback Jay Cutler from Denver in 2009. The deal for Mack is another bold move by Pace when he tries to lift a difficult franchise.

Chicago has four consecutive last places in the NFC North, five seasons in a row without a winning record and only one playoff performance since the 2006 team reached the Super Bowl.

But the Bears loaded themselves around the acclaimed quarterback Mitchell Trubisky, firing coach John Fox and replacing him with the offensive Nagy. They have added a number of new goals for making game pieces, especially the former Jackson Bowl Pro Bowl recipient Allen Robinson.

The bears resumed defensive coordinator Vic Fangio after passing him for the head coaching job and suggested Linebacker Roquan Smith with the number 8 general choice.

Now the Monsters of the Midway are adding one of the NFL's top-pass riders to a defense that is ranked 10th overall and the seventh place in bags, despite the lack of a Pro Bowl player. With his speed and strength Mack gives the Bears a huge threat on the edge to go with Leonard Floyd on the other side.