OAKLAND -- Brett Anderson's sixth workout in his anticipated return to the big league roster will take place Tuesday in Stockton, A's manager Bob Melvin said Saturday.
The left-hander will face Class A hitters in the same manner he pitched to A's batters on Friday -- two innings of 15 pitches each with about 25 warm-up throws for a total of about 55 pitches. This time, though, Anderson will not thrown from behind a protective "L" screen, which should test his reaction and put pressure on his foot.
Anderson has not pitched since April 29 and is recovering from a stress fracture in his right foot.
Catcher John Jaso, on the 7-day disabled list with a concussion since July 25, said he is still experiencing symptoms from taking foul tips off the mask, especially ringing in his ears when he wakes up.
"It seems like I was at a rock concert the night before," Jaso said.
Jaso is still not doing any physical activity to get his heart rate up, either.
"I'm itching for that," he said.
Melvin said Jaso was scheduled to undergo a battery of tests Saturday and Jaso said the A's have been in contact with a concussion specialist in Pittsburgh. It is his third concussion -- the other two were in 2005 and 2010 -- and Jaso said the effects of this one have lingered longer than the others.
"Before, my focus or concentration wasn't there," he said. "So I'd ride through it…this has been pretty consistent."
And yet, Jaso admitted that he's wondering how much of what he's experiencing is real, and how much is, literally, in his head.
"I don't want to be a hypochondriac," he said.
Eric Sogard is starting at shortstop for the first time this season and is riding a career-high 10-game hitting streak.
"Sogie's played quite a bit of short before, just not here this year," Melvin said, though Sogard does have two innings logged at the position. "He can play anywhere in the infield…and does a nice job at shortstop."
Sogard has made 30 big league appearances at shortstop, with 16 starts.
The move enables the A's to put starting shortstop Jed Lowrie in the designated hitter role and start recent acquisition Alberto Callaspo at second base.
The A's are 404-404 all-time against the Rangers/Washington Senators.