Pictures of Edelman taken over the weekend show him with a device on his thumb. He was wearing gloves on both hands.
According to published reports, Edelman will be limited for the first three weeks of training camp, which starts Thursday. The regular season begins Sept. 8.
The Patriots declined to comment.
The 33-year-old Edelman missed the first four games last season after violating the NFL's policy on performance-enhancing drugs. In the 13-3 victory over the Los Angeles Rams in the Super Bowl, he caught 10 passes for 141 yards and was the first receiver to earn MVP honors in 10 years.
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