MINNEAPOLIS -- Twins right-hander Cole De Vries said Friday that he's frustrated he'll miss the rest of the season with a cracked rib but that he's happy with the way his rookie season went.

De Vries, who was hit by a line drive in Saturday's 3-0 win over the Indians, underwent an MRI on Thursday and found out he cracked a rib. But he took the news in stride, as he knew something was wrong.

"I'm glad they did find something, because four days after the impact, I still was feeling the same, and things didn't seem like they were progressing the way they should," De Vries said. "So I was glad. I would have been very confused had it come back negative."

De Vries finishes his season as a pleasant surprise for the Twins, as he recorded five wins and a 4.11 ERA in 16 starts and one relief appearance. De Vries, who was signed as an undrafted free agent out of the University of Minnesota in 2006, also struck out 58 and walked 18 in 87 2/3 innings.

"In quick retrospect, I'm just pretty pleased with the way everything's gone," De Vries said. "I feel like I've shown well for myself. There were a few low spots in there, but I'd really say there were more high spots."

Herrmann provides protection behind dish

MINNEAPOLIS -- With Joe Mauer and Ryan Doumit both nursing injuries, the Twins selected the contract of catcher Chris Herrmann from Double-A New Britain before Friday's game against the White Sox.

The move gives the Twins another backstop along with Drew Butera, who started behind the plate for the third straight night. Mauer is out with back spasms while Doumit is dealing with a strained oblique.

"[Herrmann's] here to protect us a little bit," Twins manager Ron Gardenhire said. "Doumit is feeling better, but he's still a couple days away. He said he's ready in case of an emergency, but we need the protection with two guys hurt."

Herrmann, 24, hit .276/.350/.392 with 10 homers, 25 doubles and 61 RBIs in 127 games with the Rock Cats. He stayed fresh after the end of the Minor League season by catching Twins prospects at the club's Spring Training complex in Fort Myers, Fla., for the last two weeks.

"He's a really athletic kid," Gardenhire said. "He can play left field and is really versatile. He's got a really nice swing and can hit. And he can catch and throw. He's quick. I'm anxious to see him. He did well at Double-A and is moving right up the ladder."

Mauer has been out since Monday, but he's getting closer to making his return, according to Gardenhire.

"He did some work today," Gardenhire said. "He took some throws from second and hit in the cage. He feels better, but he's not ready to play."

Parmelee may return to lineup this weekend

MINNEAPOLIS -- Chris Parmelee was held out of the starting lineup for a fifth straight game on Friday but said he's recovered from his groin injury, sustained while running for a ball in the outfield on Sunday.

Parmelee felt good enough to serve as a pinch-hitter in Thursday's 4-3 win over the Royals and came through with a single in the eighth inning.

He said the groin injury is now behind him and that he feels good enough to be back in the starting lineup this weekend.

"I'm 100 percent right now," Parmelee said. "It's as good as it's going to feel. So I took a couple days and got it back to where it should be."

Target Field flags flown at half-staff

MINNEAPOLIS -- The flags at Target Field and all Major League ballparks were flown at half-staff on Friday night to honor four Americans slain in an attack on the U.S. consulate in Libya earlier this week.

The three flagpoles in right field -- which feature the flags of Hennepin County, the United States and Prisoners of War and Twins Territory -- all had their flags at half-staff.

Baseball Commissioner Allan H. "Bud" Selig requested all clubs honor those killed through sunset on Sept. 16 to support President Barack Obama's directive for all government buildings.

Killed in the attack on Tuesday were the U.S. Ambassador to Libya, Chris Stevens, as well as former Navy SEALs Glen A. Doherty and Tyrone S. Woods and Air Force veteran Sean Smith.