The injury occurred in Arizona while Suggs was practicing for an upcoming conditioning test, he said Thursday in a text message.
Suggs initially thought it was a sprain but a doctor determined that it was a partial tear, he said.
The Ravens issued a statement Thursday saying: "We are in contact with Terrell. He will see a specialist early next week, and we'll know more at that time."
General manager Ozzie Newsome said, "We're just waiting for Terrell to see a specialist on Tuesday, and then we'll go from there."
Suggs, the AP NFL Defensive Player of the Year in 2011, is expected to have surgery as soon as next week. A torn Achilles tendon usually requires a lengthy rehabilitation program, but Suggs has no intention of sitting out the year.
Asked if he will play in 2012, he responded, ""Absolutely," and projected his return to occur in late October or November.
The injury is a major blow to a stout defense that also features linebacker Ray Lewis, safety Ed Reed and tackle Haloti Ngata. Suggs had 14 sacks last season, forced a franchise-record seven fumbles and received his fifth Pro Bowl invitation in helping the Ravens win the AFC North with a 12-4 record.
Suggs has played nine seasons for Baltimore and has missed only three games, in 2009 with a knee injury. In six of those nine years he started every game and is the Ravens career sack leader with 82 1/2.