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Former Green Bay Packers running back Ryan Grant weighed in Tuesday night on concussions in the NFL, questioning in a series of tweets how much the league knew about the problem and whether teams lied to their players about it.

Grant was reacting to reports that former New York Giants safety Tyler Sash was diagnosed as having chronic traumatic encephalopathy (CTE), a degenerative brain disease, when he died at age 27.

In exchanges with followers on his Twitter account (@RyanGrant25), Grant raised questions of accountability and also took the NFL Players Association to task for not taking a firmer stance in negotiations with the league on matters of health and guaranteed contracts.

Grant, 33, spent virtually all of his six NFL seasons in Green Bay. The former Notre Dame star signed with the Giants as an undrafted free agent and was acquired by the Packers before the 2007 season.  He inherited the starting job at midseason and set a franchise record by rushing for 201 yards with three touchdowns in a playoff victory over Seattle. Grant rushed for more than 1,200 yards in both 2008 and ’09. Grant missed most of the 2010 season because of an ankle injury but bounced back to start 14 games in 2011.

Former Packers tight end Tom Crabtree also tweeted about concussions and CTE back in September.

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