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The 49ers and Seahawks made a habit of signing players with recent history on the other side of their rivalry throughout the 2013 season and things aren’t changing just because the regular season is over.

Coach Jim Harbaugh said Monday that the team has signed cornerback Perrish Cox. Cox started the year with the 49ers, but was released in November and wound up signing with the Seahawks. He was cut a day later, but the Seahawks brought him back later in the season before releasing him again once Walter Thurmond’s suspension came to an end.

Cox’s arrival gives the 49ers some coverage in the event the MRI on cornerback Carlos Rogers’ injured right hamstring shows something that will keep him out of the lineup for Sunday’s game against the Packers.

Cox had two tackles in nine games for the Niners and three more in two games with the Seahawks.