Izturis had a sore hamstring at the All-Star break, but was healthy when he joined the Cubs, athletic trainer Mark O'Neal said. The current injury is in the same spot on the shortstop's hamstring, and it was aggravated during the 18-inning game in Houston on Aug. 15.
"It's mild, but you don't want to turn it into major," Baker said.
Izturis underwent an MRI exam on Tuesday that revealed the severity of the injury.
"Let's get it right," Izturis said on Tuesday.
"The good thing about it is there's a lot of blood in that area and it allows it to heal," O'Neal said. "You have a more predictable healing time."
Izturis played all 18 innings in Houston, and said the next day, his leg was bruised.
"When he made a turn to run out to the outfield [on Aug. 15], he felt it pull a little bit," O'Neal said. "Then running to first [on Monday], he pulled it."
Ryan Theriot and Freddie Bynum will now share second base duties until Izturis returns. Buck Coats was called up from Triple-A Iowa to take Izturis' spot on the roster.
Welcome: Triple-A Iowa manager Mike Quade called Coats at 10 a.m. CT on Tuesday and told the young infielder/outfielder that he had to catch an 11:30 a.m. flight to Chicago and the big leagues.
"I tried to pack as much as I could," Coats said. "I'm a little stressed out, but I'm all right."
Coats was hitting .277 with 20 doubles, six homers and 49 RBIs in 118 games for Iowa, including a .289 mark against right-handed pitchers. He was the 18th-round pick in the 2000 First-Year Player Draft, and has played all outfield positions as well as second, third and shortstop.
He admits he's more used to the outfield than the infield but says, "I can fit in anywhere."
"I just try to go out and play my game and work hard and hopefully get a shot and good things will happen," Coats said. "You can't worry about what's going on elsewhere, you just have to do your job at home."
He was batting .294 this month, but says he wasn't doing anything different.
"You see the ball throughout the season differently at different times," he said. "It's the way baseball works."
He was in Spring Training with the big-league team most of the time.
"Any experience for me is awesome," Coats said. "This experience and going to camp in Spring Training, all of it is great experience. You learn a lot -- you learn a lot from older guys."
"He's a young man I liked in Spring Training," Baker said. "He has a great attitude, works hard. He's got a pretty good arm in the outfield. He'll fit in whenever and where we need him."
Coats was a little wide-eyed on Tuesday.
"I'm trying to soak everything in now," he said.
And yes, Buck is his real first name.
"That's it -- Buck Coats. No middle name," he said. "I was raised in the country."
Aches and pains: Michael Barrett was not in the lineup on Tuesday, but is improving from a bruised right arm, injured in a collision at home Aug. 9 in Milwaukee. Barrett aggravated the bruise on Friday in a collision with David Eckstein.
Kerry Wood has been rehabbing his shoulder in Phoenix, and is expected to rejoin the team in Chicago on Sept. 1.
Mark Prior will not resume throwing until three weeks after he was shut down on Aug. 11. Prior has tendinitis in his right shoulder.
Extra bases: Rookie Angel Guzman is on tap to start Wednesday unless he's needed Tuesday night. "If we need Angel tonight," Baker said, "it'll be another surprise [on Wednesday]." ... Wade Miller headed to Des Moines on Tuesday and will make another rehab start on Wednesday for the Triple-A team. However, Miller is an emergency option to start for the Cubs on Wednesday if necessary. ... Baker was unaware that Phillies center fielder Aaron Rowand had broken his ankle in the collision on Monday night with teammate Chase Utley. "It is? Oh my God. The way I saw it on the video, I thought he was lucky he didn't break his neck," Baker said. "It's a shame he came back to Chicago to do that. That's a tough one." ... The Cubs will have seven players and manager Pat Listach participate in the Arizona Fall League this year. The players include pitchers Carmen Pignatiello, Lincoln Holdzkam, Grant Johnson and Clay Rapada, and catcher Jake Fox, third baseman Scott Moore and second baseman Eric Patterson. They'll play for the Mesa Solar Sox. ... The Cubs' game on Sunday against the Cardinals at Busch Stadium will be a 7:05 p.m. CT start, and broadcast on ESPN Sunday Night Baseball.
Minor matters: Michael Restovich, Geovany Soto and Jeff Deardorff each homered to help Iowa beat Oklahoma, 7-3, on Monday. Jerome Williams gave up three runs on nine hits over 6 1/3 innings for the win. Eric Patterson had a hit, and is 5-for-11 in three games. ... Chris Shaver gave up two runs on four hits over six innings in West Tenn's 4-2 win over Huntsville. ... Donald Veal gave up two runs on four hits over 5 2/3 innings in Daytona's 7-2 win over Jupiter. Catcher Chris Robinson, acquired from Detroit for Neifi Perez, went 3-for-5 with a double and three RBIs. ... Joel Santo threw 6 2/3 scoreless innings in Peoria's 6-0 win over Southwest Michigan. Santo gave up five hits and three walks and struck out three. ... Mike Billek gave up one run on five hits over five innings in Boise's 6-5 win over Vancouver. Five players had two hits in the game.
On deck: Guzman will start in Game 3 of this four-game series Wednesday at 7:05 p.m. CT against the Phillies. The game will be broadcast on WGN Radio and WGN TV.