A’s Marcus Semien is making progress, slowly – SFGate – SFGate

Photo: Scott Strazzante, The Chronicle

Oakland Athletics' Marcus Semien shares a laugh with San Francisco Giants' Buster Posey during Bay Bridge Series at AT&T Park in San Francisco, Calif., on Friday, March 31, 2017.

Oakland Athletics' Marcus Semien shares a laugh with San Francisco Giants' Buster Posey during Bay Bridge Series at AT&T Park in San Francisco, Calif., on Friday, March 31, 2017.

As Marcus Semien is making progress, slowly

Shortstop Marcus Semien, who had wrist surgery April 18, began hitting off a tee on Monday, but he might not be back with the As this month.

Semien will need plenty of time to work his way back from a hairline fracture of the scaphoid bone, and when he goes on a rehab assignment within the next few weeks, it wont be just two or three games, according to manager Bob Melvin.

Position players can spend a maximum of 20 days on a minor-league rehab assignment, but Semien isnt expected to need that much time. A happy medium of a week or two is likely.

Melvin said that Semien is allowed only to hit with a light fungo bat so far, so hes searching around for the biggest fungo he can find, trying to simulate a bat. ... Its going to be more about holding him back - hes got a target in his mind when he wants to be playing. Hes eager, he wants to be moving along. He wants to get out there as quickly as he can.

Semien is eligible to come off the DL on June 14, and Melvin said Semien really would like to be back for the Marcus Semien action figure giveaway night, which is June 18. Thats when he wants to play but I dont know if that will be the case, Melvin said. I hate to put a number on it but I would say June is probably going to be tough.

Melvin said that starters Kendall Graveman (shoulder) and Chris Bassitt (Tommy John surgery) are improving but neither has resumed throwing.

Reliever Bobby Wahl (shoulder) said he is not yet throwing, either, but he is getting treatment and is strengthening the shoulder and hes feeling much better. Initially, he was having trouble even washing his hair, but he said within a week of going on the DL last month he was able to do all everyday activity.

Susan Slusser is a San Francisco Chronicle staff writer. Email: sslusser@sfchronicle.com Twitter: @susanslusser

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