All three deals can become official when the new league year begins Wednesday.
Mathieu is set to count $14.1 million against the Cardinals' cap in the third year of a five-year, $62.5 million pact.
Former Minnesota Vikings quarterback Sam Bradford intends to sign a two-year deal with the Arizona Cardinals, 98.7 FM Arizona's Sports Station's John Gambadoro reports. His one-year deal is worth up to $20 million, including $15 million guaranteed and an additional one-year option for $20 million.
TE Derek Carrier returns to Raiders on 3-year deal
The 30-year-old played well for the Raiders down the stretch last season, after a year and a half of disappointing production. Last season, Carrier played for the Los Angeles Rams, where he was traded by Washington.
Look for Bradford to be the starter but it will be highly disappointing if the Cardinals were done at the position. And if the Cardinals want him back in 2019, they'll have the ability to exercise an option on his contract for another $20 million.
The former Heisman Trophy victor and first-round pick by the St. Louis Rams in 2010 has made $114 million over his career, but injuries have haunted Bradford. Minnesota brought him in via trade with the Eagles as a stopgap when Teddy Bridgewater went down with a gruesome knee injury before the 2016 season. They have pick No. 15 in the first round. He also tore the ACL in his left knee as a rookie in 2013. He only appeared in one more game for the remainder of the season, missing time due to injury as Case Keenum took over the signal-calling duties.
Running back is another area to possibly address in the even their feature back David Johnson gets hurt again, Carlos Hyde, who is a free agent from the 49ers is a name that could be thrown around in their organization.
Bradford, 30, completed 72 percent of his passes while averaging 259 yards per game the last two seasons with the Vikings.