Arizona Cardinals linebacker John Abraham could be on the verge of retirement after suffering a concussion in Monday night's game against the San Diego Chargers. Abraham left the team on Wednesday, according to reports.

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Reports say Abraham has been suffering from severe memory loss for more than a year and he believes he needs to take some time away from football to recover. Abraham is ninth on the all-time list with 133.5 sacks in 192 career games, the most among active players. He was named to the Pro Bowl five times and earned All-Pro honors three times. Before joining Arizona last year, he played for the New York Jets and the Atlanta Falcons.

The Cardinals placed him on leave to free up a temporary roster spot, which they used to sign linebacker Marcus Bernard. According to Kent Somers of AZCentral.com, Abraham will be placed on a reserve list and won't be able to play again this season if he does not return to the team in five days.

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Abraham, 36, played in all 16 games last year and recorded 11.5 sacks. Somers also said Arizona coach Bruce Arians believes this is Abraham's first concussion.

Abraham was arrested over the summer on June 29 and was charged with DUI. His arraignment is scheduled for Oct. 10. He spent time at a rehab facility and missed the first three weeks of training camp before reporting on Aug. 14.

The loss of Abraham is a huge blow to the Cardinals but they still have a strong defensive front led by Larry Foote and Tony Jefferson, who had eight tackles each in Monday's 18-17 win.