Tigers coach Dabo Swinney said the group plans to enroll at Clemson next January.
Lawrence is a 6-foot-4, 196-pound quarterback from Cartersville, Georgia, who is considered the No. 1 pocket passer in the country according to ESPN.com's recruiting rankings.
Thomas is a 6-3, 269-pound defensive end from Florence who's listed as the country's No. 2 prospect, according to ESPN's rankings.
The financial aid agreements are not binding and players still must sign a letter of intent before enrolling at school.
Three others in ESPN's top 300 prospects also signed: defensive tackle Josh Belk of Fort Lawn, receiver Derion Kendrick of Rock Hill and linebacker Mike Jones Jr. of Nashville, Tennessee.
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