The moves were announced on Tuesday.
Bass appeared in 13 games with one start over two seasons with the Bears. He had 20 1/2 tackles and an interception, which he returned for a touchdown.
Frey made seven starts and appeared in 19 games over three seasons with Chicago, with 73 tackles, one forced fumble, one fumble recovery and two pass breakups.
Louis-Jean is an undrafted rookie free agent out of Boston College.
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