TUCSON, Ariz. -- Position players aren't due to report until Wednesday, with the first full-squad workout set for Thursday, but more and more of them keep showing up each day.

On Monday, there was Craig Counsell, Eric Brynes, Conor Jackson and Jeff DaVanon, to go along with, among others: Orlando Hudson, Damion Easley, Tony Clark, Andy Green, Scott Hairston and Justin Upton.

The players are allowed to be in camp so long as they don't participate in team drills.

"I am really excited to see that these guys are out there working out themselves," Melvin said. "I got fired up to see all these guys out there. It looked like a full squad workout out there. Guys are enthusiastic, getting to know each other even before we get out on the field Thursday."

Clark, who has been here since before pitchers and catchers even reported, said the time the group spends by itself is valuable.

"The longer you play together, the better the opportunity of meshing together," he said.

Meeting time: The team's younger pitchers will meet with pitching coach Bryan Price early Tuesday morning. The hurlers were told not to bring their glove to the session, which will deal with the mental aspects of being a young pitcher in the big leagues.

"There's so much more when you get to the big leagues than a young player can anticipate," Price said. "And that's beyond the pressures of trying to pitch well from the start. So we will have a good long talk about some of the things that can end up being unexpected hurdles when guys get here."

Some of the pitchers, like Brandon Medders, have some big-league service time, and Price will ask them to share what they've learned with the others.

Looking good: One pitcher who has caught Melvin's eye so far this spring, as well as with how he threw in workouts at Chase Field, is Casey Daigle.

The right-hander made the club as the fifth starter in 2004, but struggled before being sent back to Triple-A. Last season, the club made him into a closer, and he had a successful year at Double-A, racking up nine wins and 19 saves.

Daigle throws a fastball and slider, but doesn't have the third pitch that a starter needs. A reliever, though, can get away with just two pitches.

"He just seems like a different guy," Melvin said. "He had a lot of success, and you can see that he's got a lot more confidence in myself. I think it's showing up that he's better suited to going out there for an inning or two, and just going as hard as he can for that inning."

Getting physical: Reliever Luis Vizcaino took his physical in Phoenix on Monday and will join the team for his first workout on Tuesday.

Vizcaino's arrival in camp was delayed by an illness in his family.

Back at it: Medders has not thrown off the mound yet after tweaking his scapula. The right-hander is expected to be able to play catch on Tuesday and throw his first bullpen session on Wednesday.

Arrival: The Diamondbacks invited prospect Chris Carter to camp on Monday.

The first baseman, who hit a combined 31 homers between Class A Lancaster and Double-A Tennessee, was brought in when the Diamondbacks decided they needed an extra first baseman.

The move leaves Arizona with 57 players in camp.