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3/7/2014 5:14 P.M. ET

Headley's strained calf continues to improve

PEORIA, Ariz. -- Third baseman Chase Headley's strained right calf continues to improve and is already to the point where it's almost like the injury never occurred.

"That was one of the things we talked about," Headley said of his discussions with the training staff. "… They trust me to say if it's feeling out of the ordinary."

To this point, it hasn't, which is why Headley -- who suffered the strain during an infield drill on Feb. 22 -- has advanced to the point of taking ground balls as well as hitting on the field in batting practice.

On Friday, Headley's plans were to go through another full day of drills on the practice field, while also doing some light running.

This is all part of the progression that is aimed at getting Headley back on the field by mid-month or just a little later.

Headley doesn't have a firm feel for his timeline to appear in a Cactus League game, though he knows exactly what he needs to feel ready for Opening Day on March 30 against the Dodgers.

"Probably 15-20 [plate appearances] from each side," said Headley, a switch-hitter. "And getting those in a condensed sense, not like over two weeks."

The Padres have their only off day of the spring on March 19 before playing seven consecutive games. The team then takes a day off to travel to San Diego before playing two more exhibition games against the Indians on March 28-29 before starting the season the following day.

To date, the Padres have used several players at third base during Cactus League play, including Ryan Jackson, Alexi Amarista and Jace Peterson. Jackson, trying to win a spot on the 25-man roster for the start of the season, has impressed the staff with his defense at third base and shortstop.

Padres claim outfielder Castellanos off waivers

PEORIA, Ariz. -- A day after the Padres discovered outfielder Cameron Maybin will miss four to six weeks with a ruptured biceps tendon, the team claimed outfielder Alex Castellanos off waivers from Texas.

Castellanos could very well be in the running for a reserve outfield job with the team, as he's capable of playing three outfield spots. He could report to big league camp as soon as Saturday.

The 27-year-old has appeared in 24 Major League games over the last two seasons with the Dodgers, hitting .171 in 41 at-bats with two home runs.

Castellanos hit .257 with 19 home runs, 61 RBIs and 19 steals in 105 games in 2013 with the Dodgers' Triple-A affiliate in Albuquerque.

He was originally drafted in the 10th round of the 2008 First-Year Player Draft by the Cardinals as an infielder but has since moved to the outfield.

Castellanos has now been a part of four organizations since the end of last season -- Dodgers, Red Sox, Rangers and now the Padres.

In order to make room on the 40-man roster, the Padres placed left-handed pitcher Cory Luebke on the 60-day disabled list. Luebke had his second Tommy John surgery last month after having the same surgery in May of 2012.

Short hops

• Closer Huston Street, sidelined with a slight groin pull, played long toss on Friday morning and if all goes well, could progress to a side throwing session as soon as Saturday. Manager Bud Black said he's not at all worried about Street as it's still early in camp and the team has a lot of time - and innings to be had - before the regular season starts on March 30.

• The Padres' games on Saturday and Sunday will be televised by Fox Sports San Diego. The game Saturday will be against the Indians at 12:05 p.m. PT. The game on Sunday against the Rangers will also be shown live at 12:05 p.m. PT

• Manager Bud Black said Friday that the team could begin to thin the roster in the next few days, as the Padres still have 60 players in camp. Those roster moves will see most, if not all, of the players heading over to Minor League camp.

Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.