PHILADELPHIA -- Tadahito Iguchi might not be it.

The Phillies are still sniffing around for possible help to bolster a starting rotation that has compiled a National League-worst 4.81 ERA.

Charley Kerfeld, a special assistant to the general manager, jetted to Houston to watch the Astros-Padres game. Woody Williams started Friday for Houston, and the Astros also have relievers Brad Lidge, Chad Qualls and Dan Wheeler, though they aren't likely to trade any of that trio.

Baseball sources say that the teams are discussing other possibilities, though Mark Loretta is now unnecessary since the Phillies acquired second baseman Tadahito Iguchi on Friday. The Astros want outfielder Michael Bourn, whom the Phillies are reluctant to deal.

Philadelphia is also believed to be in play for Toronto righty Josh Towers, who allowed four runs in 5 1/3 on Friday against the White Sox. The Blue Jays haven't heard back from the Phillies since the club dispatched personnel to watch Towers pitch in Toronto last week.

Jays general manager J.P. Ricciardi doesn't believe the Phillies are interested in trading for the right-hander, who is under contract for $2.9 million this year.

"They came to see him pitch and we never received another call back," Ricciardi said. "I would just assume he wasn't their cup of tea. That's really the only call we've gotten on anybody that's been serious about coming over to see our guys.

"If we can make additions, it's going to be by subtraction," he added. "We'd have to trade someone that for us isn't a part of going forward. I don't really see us doing anything [before Tuesday's trade deadline]."

The Phillies will keep looking, according to assistant GM Mike Arbuckle, but don't want to trade just for the sake of it.

"We have to take a common-sense approach, and a lot of pitchers out there don't improve us," Arbuckle said. "It doesn't make sense for us to make a move unless we're improving ourselves. We're looking for anything that upgrades us, period. We wouldn't rule anything out that makes us better."

Tag, you're it: Aaron Rowand picked the worst time to suffer a freak injury. The center fielder strained his left shoulder while playing tag with his kids on Thursday night, and was scratched from Friday's game.

"I was in my backyard and just strained my capsule," Rowand said. "I was standing out there and my kids were playing tag with the neighbors. There was like eight or nine kids out there and they were all running around. I tagged one of my neighbor's kids at a wrong angle. It was a total freak thing. I wasn't even running around.

"I probably broke some of the scar tissue loose from my surgery [in 2002], which in the long run is probably better."

Myers returns: Brett Myers returned to his locker in the home clubhouse, and likely to the closer's role. As expected, the team activated Myers from the 15-day disabled list, clearing his roster spot by optioning reliever Mike Zagurski to Triple-A Ottawa.

Myers, who had been out with a strained shoulder since May 23, threw three rehab outings with Class A Clearwater earlier in the week and said his arm felt fine.

"It wasn't hard to start throwing strikes again, but it was more or less trying to get my arm conditioned to throw 25 pitches," he said.

As for Zagurski, the lefty learned plenty during his extended time with the Phillies, and did well enough for a kid who started the season with Class A Clearwater.

"He took it fine," Phillies manager Charlie Manuel said. "He should have taken it fine. I like Zagurski. I like his demeanor. I think he's going to be a big-league pitcher for a long time."

Philling In: Dr. Michael Ciccotti said it's "very possible" that injured starter Freddy Garcia could return after three or four more weeks of rehab. Garcia hasn't pitched for the Phillies since he left a June 8 start vs. the Royals with right-shoulder pain.

Coming up: Cast off by three teams this season, righty J.D. Durbin has pitched his way into good standing with his fourth organization. The right-hander is coming off a five-hit shutout on Sunday against the Padres, getting the best of All-Star pitcher Jake Peavy. Durbin will face Pirates southpaw Shane Youman in the second game of the weekend three-game series at 7:05 p.m. ET on Saturday.