The Eagles did not practice on Tuesday. The team did not announce if Maclin would practice on Wednesday.
Maclin caught 70 passes for 964 yards last season. His 10 touchdown receptions tied for seventh in the NFL.
Maclin reportedly contracted mononucleosis in the spring, but the Eagles have not said whether his absence from training camp was related to that. Coach Andy Reid has said his absence was excused.
Two-time 1,000-yard receiver DeSean Jackson has been absent since camp started July 27, presumably to protest lack of progress in talks toward a new contract.