Free agent wide receiver Plaxico Burress told WFAN Radio in New York Monday that Jets quarterback Mark Sanchez dealt with previously undisclosed shoulder injuries last season according to a story by Jane McManus of ESPNNewYork.com .

In recent years the Jets have been cagey about injuries to their quarterbacks’ throwing arms. In 2008, Brett Favre revealed a persistent shoulder injury at the end of the season. In 2010, Sanchez’s shoulder was an ongoing storyline, and at the end of the season he opted against surgery. Last season, Sanchez was not on the injury report for his shoulder, but had a neck injury listed in Week 15 and Week 16 that affected his throwing ability. ESPN New York reported in February that Sanchez underwent “precautionary” MRIs on his shoulders, but he was never listed on the injury report with a shoulder injury. Although Sanchez’s shoulders have now come up in two consecutive offseasons, it’s not a concern entering camp

Sanchez only completed five passes longer than 21 yards all season. After the Nov. 17 loss in Denver, Sanchez was believed to have pinched a nerve in his neck. At any rate, his passing game suffered. He ended with 26 touchdowns and 18 interceptions for a 78.2 quarterback rating.

“He was battling some injuries last year, shoulder-wise that a lot of people didn’t know about,” Plax said of his former teammate.