The A's acquired the 6-foot-2, 235-pound Allen on July 31 from Arizona along with pitcher Jordan Norberto for pitcher Brad Ziegler. This is his second career midseason trade. The White Sox traded him to Arizona on July 7, 2009.
A's manager Bob Melvin said that it didn't take long for Allen to impress him with his performance in the field and at the plate.
"The small sample's been pretty good, across the board, too," Melvin said. "The at-bats, the at-bats against left-handers, his defense, his base running. He's a good athlete, and you don't see that that often in your first baseman, to be that good an athlete.
"There's going to be periods when you're not going to swing the bat well, but you bring your glove out there and you make everybody in the infield that much better by picking balls and doing such over at first base. He runs the bases very well. He's been very impressive to this point."
Allen came to the A's with a reputation for being a power hitter, but no one expected him to hit for such a high average. In 65 career games with Arizona, he hit eight home runs and batted .213. This year he hit three home runs in 11 games with Arizona, but has yet to hit his first long ball for Oakland.
"You see the power in batting practice, and I think he's a couple feet away from three home runs already," Melvin said. "At this park, especially at night, it can be difficult to go the other way like he did last night, hit the ball off the top of the wall. The home run numbers will come. It's nice to see the consistent at-bats that we're getting out of him."
As for his defense, Allen said that that's a product of years of hard work.
"It took me a while to get a grasp of it," Allen said. "The past few years I really bore down on it. I'm feeling more comfortable. Once you get in that groove, things look smooth. They're really not, but you've got to keep practicing just to stay a decent defensive player."
Allen said that he had "mixed emotions" when he heard that he had been traded to the A's. He also said that he wasn't aware of the A's history of giving young players opportunities at the big league level.
"All in all I'm happy about it," Allen said. "They called me up, gave me an opportunity, and thankfully enough I've been playing really well."