Oakland A's injury update: Rangel Ravelo will have wrist surgery Friday

Oakland Athletics infield prospect Rangel Ravelo, acquired in the Jeff Samardzija trade, will have right wrist surgery on Friday. Ravelo aggravated a wrist problem he had during the offseason swinging a bat, Matt Kawahara of the Sacramento Bee tweets.

Ravelo, turning 23 in April, was not expected to contribute to the major league club this year. He ranks 12th in the Athletics Nation Community Prospect List. No timetable has been announced for Ravelo's recovery, though a quick Google search for "mlb wrist surgery weeks" revealed timetables from six weeks to 12 weeks.

Because Ravelo is on the 40-man roster, and an injured player cannot be placed on optional assignment, he will eventually be placed on a major league disabled list to start the season and will obtain service time until he is ready to return to action and be optioned to the minor leagues.

Ike Davis back spasms will keep him out until at least Sunday

First baseman Ike Davis has been held out of games due to back spasms since Wednesday, the San Francisco Chronicle's John Shea tweeted. He was listed as traveling with the team for the split-squad games in Las Vegas on Friday and Saturday, but he has been ruled out of games until at least Sunday, Jane Lee tweets.

Coco Crisp may be back in action Friday

Left fielder Coco Crisp, held out after experiencing "elbow soreness" during Monday's game, may return as soon as Friday or Saturday, tweeted John Shea. An MRI returned negative for anything more serious.