Veteran outside linebacker Terrell Suggs, nose tackle Haloti Ngata and defensive end Chris Canty are attending the Ravens' mandatory minicamp after being absent from all of the organized team activities this spring.
Under the NFL collective bargaining agreement, one full-team minicamp is mandatory to attend or players can face fines approaching a total of $70,000.
Thomas was drafted in the third round by the Colts in 2010, but missed his entire rookie season with a knee injury.
Thomas, 27, signed with the Toronto Argonauts of the Canadian Football League in April.
A 6-foot, 192-pound former SuperPrep All-American, Thomas has recorded 32 tackles in three NFL seasons.
Cody isn't expected to return until training camp.
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