The offseason started a few weeks ago with voluntary workouts for veteran players. Now, after last week's NFL draft, it's time for the rookies and the undrafted free agents to start putting in their work during the next three days at Valley Ranch.

The first of two practice sessions starts Friday at 10:30 a.m. CT.

What happens today: The Cowboys will have seven draft picks, 21 undrafted free agents and at least 10 tryout invitees work out this weekend at Valley Ranch. CB Morris Claiborne, the sixth overall pick of the draft, will be in attendance but he won't practice as he's still recovering from left wrist surgery.

PLAYERS TO WATCH

Saalim Hakim, WR, Tarleton State: The brother of former NFL player Az-Zahir Hakim spent just one season at Tarleton State after playing at Palomar Junior College in California. Hakim, an undrafted free agent, caught 18 passes for 358 yards and two touchdowns for Tarleton State, including a game-winning catch against Texas A&M Commerce in 2010. Hakim missed the deadline to declare for the draft after his 2010 season and spent 2011 in the United Football League. Hakim has been clocked at 4.29 in the 40.

Lionel Smith, CB, Texas A&M: The speedy cornerback -- clocked at 4.44 in the 40 -- can play both spots. During his college career, Smith stripped Cowboys sixth-round pick James Hanna after a reception and stopped Iowa State's James White at the goal line. The undrafted cornerback will have to make this team on special teams.

Ronald Leary, G, Memphis: The Cowboys held a private workout for Leary with offensive line coach Bill Callahan. The Cowboys like his size because he can play both guard spots, but the undrafted free agent suffers from chronic knee problems and his long-term future is in doubt. The Cowboys are taking a flier with Leary. If he remains healthy, he could be the backup guard.

Matt Johnson, S, Eastern Washington: The Cowboys got a fourth-round pick who picked up 17 interceptions during his career. Johnson can play center field and near the line of scrimmage. Johnson gives the Cowboys comfort in knowing he has a habit of defending receivers at the point of attack.

Danny Coale, WR, Virginia Tech: The fifth-round selection gets a chance to impress the coaches by working out of the slot and playing both receiver spots. He's got the speed to play the position and runs good routes and displays good hands. But can he beat out a group of backup receivers, led by Kevin Ogletree, to make the final 53-man roster?