Randy Gregory is preparing to apply for reinstatement to the NFL, according to Jerry Jones.

The Dallas Cowboys are hopeful, but not confident that the defensive end will play in 2018.

"I'm not confident but I do see where his heart is," Jones said. "He's one of the smartest people that have played this game. By documentation he is. So he's smart. That's a tremendous step. Of course he's had that same IQ since he's had these issues. That's the issues. This is definitely a medical issue. There's no doubt in my mind (it's) medical. That's another campaign right there."

Gregory has had multiple violations of the NFL's substance-abuse policy when it comes to marijuana. A combination of failed and missed tests caused his season-long suspension in 2017.

He is eligible to apply for reinstatement and has been meeting what Jones called "subjective," and "factual" standards in the process.