The Cubs acquired outfielder Andrew Lopez and right-handed pitcher Gregory Reinhard for Ryu, 23, who was 0-1 with an 8.40 ERA in 10 games with the big-league team, including one start last season. At Triple-A Iowa, Ryu was 8-8 with a 3.23 ERA in 24 games.

"It's one of those that makes a lot of sense for both clubs," Cubs general manager Jim Hendry said Tuesday of the deal. "It's a good opportunity for J.K. I feel he can help somebody in the fourth or fifth spot [of the rotation] or as a long man. Except for his bad start against the Braves, he had a solid year last year. At the same time, we have a lot of depth to where he would fall behind some people."

In that one start against Atlanta on May 28, Ryu gave up six runs on seven hits, including four homers, over 1 1/3 innings. In nine outings as a reliever, the right-hander gave up eight earned runs on 16 hits over 13 2/3 innings, striking out 17.

Lopez, 20, was an eighth-round pick in the 2005 First-Year Player Draft, and he batted .256 with four home runs and 27 RBIs for Class A Princeton last season.

Reinhard, 23, was the Rays' sixth-round pick in 2005, and he struck out 134 over 142 innings for Class A Southwest Michigan last season. He attended the University of Wisconsin-Whitewater and set the school record with 19 strikeouts in a game against Wisconsin-Stout on April 17, 2005.

The Cubs had to make a roster move after adding Cliff Floyd and Jeff Samardzija in January. Hendry said scouting director Tim Wilken was influential in picking the two players from Tampa Bay's system. Wilken was the Rays' scouting director in 2005, and he had drafted both players.

"Hopefully these guys will be contributors to the Cubs down the road," Hendry said.

Cubs pitchers and catchers report on Wednesday at Fitch Park in Mesa, with the first workout scheduled for Thursday.