PHOENIX -- Kelly Johnson knew who was to blame.

As soon as the D-backs' second baseman heard the song "It's Raining Men" blaring from the Chase Field speakers as he stepped into the batter's box Tuesday night, he knew first baseman Adam LaRoche was responsible for the prank.

"I was trying to find him in the dugout and I saw him looking away," Johnson said. "Mark [Reynolds] and Augie [Ojeda] were dying laughing. It was funny. I was completely caught off guard."

LaRoche said after the game that the joke was payback for a prank that Johnson pulled on him earlier this year.

"He's been telling me for a while that it's been coming, but I was kind of hoping he would forget," Johnson said.

Johnson figured after the first at-bat, the joke was over, but when he stepped into the box for his second at-bat, "It's Raining Men" was once again played.

"The second time was not as funny," Johnson said.

The prank could live on for a while. One fan at Wednesday's game had a sign that said "It's Raining Men -- Go Kelly Johnson" with a drawing of an umbrella.

According to LaRoche, there is still more to come.

"Yeah, he said something to me last night about it only being phase one," Johnson said. "If you ask me, we're even, so if he does anything else, I'm going to have to start thinking about getting him."

Allen adds versatility to D-backs' roster

PHOENIX -- Left field or first base, it makes no difference to Brandon Allen.

The D-backs' prospect is just happy to be in the big leagues.

Allen was one of four players the D-backs added Wednesday as the rosters expanded for September and he made an instant impact, launching a go-ahead grand slam in Arizona's 5-2 win over San Diego. The 24-year-old was acquired by the D-backs last year from the White Sox and hit .202 in 104 late-season at-bats.

When the club signed first baseman Adam LaRoche in January, it left Allen without a spot on the roster and he spent this season at Triple-A Reno.

A shoulder injury contributed to his slow start at the plate, but Allen finished with a .261 batting average to go with 25 homers and 86 RBIs. In addition, he added versatility to his game, learning how to play left field.

"He's got on-base skills, he's got power and he's got athleticism," D-backs interim GM Jerry Dipoto said.

"I got comfortable," Allen said of playing left field. "I have fun out there, it's fun to play the position and I'm trying to be good at it, real good at it."

Allen certainly looked good when he jumped and crashed into the left-field wall to catch a Nick Hundley drive in the fourth inning. It was the first fly ball hit to him in the big leagues.

It made Reno manager Brett Butler's scouting report to D-backs manager Kirk Gibson look prophetic.

"Bugsy says he's fine," Gibson said. "He's not passive out there. He doesn't have a problem with the wall, dives for the ball. Probably the biggest thing will be his arm adjusting from the infield to the outfield."

D-backs begin September callups

PHOENIX -- The D-backs added four players Wednesday as rosters expanded for September, and there will be more to come as their Minor League affiliates begin wrapping up their seasons.

Pitcher Leo Rosales was activated from the 60-day disabled list and fellow hurler Carlos Rosa was promoted from Triple-A Reno along with first baseman Brandon Allen and infielder Tony Abreu.

"Intermittently we'll be adding more guys," interim GM Jerry Dipoto said. "Our Double-A Mobile club is going to the playoffs and has a chance to win the Southern League title so we want to give them every opportunity to do that."

Rosales was placed on the disabled list April 28 and underwent surgery to repair a stress fracture in his right foot.

"It's been a long time coming," Rosales said of getting back to the active roster. "But it feels great. I'm going to try and do my best this month ... and finish strong."

Rosa, who was acquired May 1 from the Royals, appeared in 15 games earlier this year with the D-backs and was 0-2 with a 6.75 ERA.

Abreu was with the D-backs until being optioned to Reno on Aug. 4 as the team tried to get him some consistent at-bats after getting limited playing time at the big league level.

"The reason we sent him down was looking at his development," D-backs manager Kirk Gibson said.

Abreu made the most of his increased playing time going 33-for-94 (.351).

Allen was acquired from the White Sox last year and hit .202 in 104 at-bats.

D-backs renew agreement with Reno

PHOENIX -- The D-backs have renewed their agreement with their Triple-A affiliate in Reno for two more years through 2012.

Team president and CEO Derrick Hall led a front office contingent in Reno on Wednesday that included special assistants Roland Hemond and Luis Gonzalez along with top executives Cullen Maxey and Tom Harris.

The D-backs had their Triple-A team in Tucson for 11 seasons before the franchise moved to Reno in 2009.