PHOENIX -- John Jaso, who hasn't caught in a game since suffering a concussion last July 24, is in the lineup for the A's Cactus League opener Wednesday against the Giants in Scottsdale Stadium.

Jaso first went on the special seven-day disabled list available to concussion victims, but he didn't recover quickly, wound up missing the rest of the season and the playoffs and didn't get fully right until the offseason.

"I'm excited to put on the gear, get back there and call some pitches,'' Jaso said. "It will be a real confidence boost just to do that. I'm not thinking about the concussion. I'm going out there thinking like it never happened."

The A's come into camp with three holdover catchers including lefty-hitting Stephen Vogt and right-hander Derek Norris as well as the left-handed Jaso. It's possible all three will make the March 31 opening day roster with Jaso getting time at D.H., but there are no guarantees, so the catching position joins second base and first base as the positions most up for grabs in the A's camp heading into Cactus League play.

Jaso said "if it's up to me I'd like to catch as much as possible,'' which makes Wednesday's game important.

"Maybe there is a little trepidation (for Jaso),'' manager Bob Melvin said in running Jaso out for the first time. "I know he's eager to catch. Why not have him do it on the first day?''

  • Josh Reddick's surgically repaired right wrist will be on display Wednesday against the Giants.

    Melvin said spring training to date has shown a new and improved Reddick.

    "He looks really good,'' Melvin said. "His balance is as good as I've seen it since (2012). The ball is jumping off his bat. He's not (straining) to create torque when he swings.''

  • Fernando Rodriguez, who missed all of last season following Tommy John-style ligament replacement surgery, faced hitters for the first time Tuesday. "His fastball was moving down in the zone and his changeup was good,'' Melvin said. "It was like Christmas Day for him.''

  • Infielder Craig Gentry (back strain) is improved, Melvin said, but the club isn't ready to set a timetable to have him fully involved. That didn't stop Gentry from suiting up and joining the club at Papago Park for Tuesday's workout, which came as a surprise to Melvin.

  • Melvin spent two hours Monday at a briefing for managers on the replay system Major League Baseball has installed for 2014, and a little time was given over to the new home plate collision rules. The manager said "I walked away dizzy'' after the session.

    "It was a long meeting, and rightly so. We need answers and spring training will be part of the process.''

    The replay rules will be in force for all televised spring games, which for the A's is eight games.

  • Tuesday was the last full day at Papago Park for the A's, who will work the rest of the spring at their Phoenix Municipal Stadium site. After this year the team moves to Mesa. Most of the players and coaches say they will miss Papago and Muni.

  • The lineup for Wednesday's game against the Giants: Sam Fuld, center field; Nick Punto, shortstop; Reddick, right field; Yoenis Cespedes, designated hitter; Brandon Moss, first base; Alberto Callaspo, third base; Jaso, catcher; Michael Taylor, left field; Eric Sogard, second base and right-handed pitcher Jesse Chavez starting. No one is likely to play a full game. Josh Lindblom and Evan Scribner could be the first two pitchers following Chavez. Lefties Fernando Abad and Andrew Werner could get an inning, too.