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09/28/12 8:14 PM ET

Cranky right knee keeps Forsythe sidelined

SAN DIEGO -- Infielder Logan Forsythe was out of the starting lineup Friday for the second time in as many days with soreness in his right knee.

Forsythe, who has made 69 starts this season at second base, was a late scratch before the Padres' game Thursday against the Dodgers.

"It wasn't one event. ... It was something he felt coming on," said Padres manager Bud Black. "I think that it manifested itself in the batting cage early on and he felt some discomfort taking ground balls."

Forsythe was replaced in the lineup Thursday by Andy Parrino, who got the start at second base Friday in the first game of a three-game series against the Giants at Petco Park.

This isn't the same knee that Forsythe had surgery on last fall, when he had a procedure done to repair his left meniscus.

Forsythe has impressed this season after missing the first 54 games of the season after breaking a bone in his left foot in Spring Training.

He has a slash line of .282/.352/.396 in 298 at-bats with five home runs and 24 RBIs this season and has been the starting second baseman for most of the second half but has also started games at shortstop and third base.

Kelly to get extra work in Arizona Fall League

SAN DIEGO -- The Padres will send 22-year-old rookie pitcher Casey Kelly to the Arizona Fall League in October to add additional innings to make up for time he lost on the disabled list earlier in the season with soreness in his right elbow.

The team will also ask Kelly to work more on his changeup, a pitch that the Padres feel can be a good pitch for him moving forward, but only if he is able to reduce the velocity on it.

"He needs a bigger differential [in velocity]," said Padres manager Bud Black, noting that there is not enough of a difference between his mid-90s fastball and a changeup in the high 80s.

"It's a good opportunity for him to try things mechanically, try different grips."

Kelly is 2-3 with a 6.21 ERA in his first six Major League starts. He's shown a live fastball at times and a very good curveball.

Kelly, who will start Tuesday against the Brewers in Milwaukee, has thrown a combined 66 2/3 innings between the Minor Leagues and his time with the Padres. They would like him to get more work to get him stretched out and ready for the start of Spring Training, when he will contend for a spot in the starting rotation.

Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.