Giants linebacker Victor Butler, a journeyman defender who last played with the Saints and signed a futures contract at the end of the 2014 season, was suspended four games on Friday for violating the NFL's performance-enhancing drugs policy.

The league did not specify the substance that triggered the suspension.

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Butler, 27, spent the first six years of his career with the Cowboys and later the Saints, Cardinals and Colts. A fourth-round pick of the Cowboys in 2009, Butler had 11 sacks in four seasons with Dallas. He signed a free-agent deal with the Saints in 2013, but suffered tore knee ligaments in training camp that year.

He played with the Cardinals and Colts last season before being released by Indianapolis on Nov. 26.

A person familiar with the Giants' situation said the team will keep him on its roster for now. Butler is permitted to practice with the team until the first week of the regular season.