Suggs suffered a torn Achilles tendon in April. The linebacker originally had pointed to returning to the field in November, but has since backed away from that goal.
Suggs said he hurt himself while working out, but has been dogged by rumors that he suffered in the injury playing basketball.
By placing Suggs on the PUP list, the Ravens can activate him by their sixth game at the earliest. He then can practice for three weeks before either being placed on the active roster, injured reserve or waived.
Stevie Baggs (leg), Darryl Blackstock (leg), Emanuel Cook (leg) and Ryan McBean (ankle) were all placed on injured reserve.