Teagarden has been suspended 80 games for violating the Joint Drug Prevention and Treatment Program, Rich Dubroff of CSN Mid-Atlantic reports.
The 32-year-old appeared in only eight games with the Cubs last year and is currently without a team. It's entirely possible Teagarden has played his last game at the major league level, but he may be able to land a minor league depth role once the suspension is served. Teagarden was caught on camera discussing PED use in an infamous Al Jazeera report from earlier this year.
Teagarden declined an assignment to Triple-A Iowa and elected to become a free agent, Carrie Muskat of MLB.com reports.
Teagarden has a career batting average of .202 in 510 at-bats, though he does have 21 home runs. He'll try to catch on with another team next spring.
Teagarden was added to the 40-man roster Sunday, Mark Gonzales of the Chicago Tribune reports.
No specific reason for Teagarden's late addition to the 40-man roster, but he'll provide some organizational depth for the Cubs.
The Cubs have demoted catcher Taylor Teagarden to Triple-A Iowa to make room for left-hander Clayton Richard, who starts Sunday in Milwaukee, per the Chicago Sun-Times.
Richard pitched three times for Chicago in July with two starts. A strong outing was followed by two poor ones and he ended up back in the minors with a 5.40 ERA.
Cubs catcher Miguel Montero isn't in Sunday's starting lineup. Montero was forced to leave Saturday's game after jamming his thumb.
Taylor Teagarden gets his third start of the season behind the plate in Montero's place. He's started three of the last six.
The Cubs have placed catcher David Ross on the 7-day disabled list due to a mild concussion. The move is retroactive to Thursday. Ross left Wednesday's game in the seventh inning, though no injury was reported at the time.
Still, Ross will take the minimum seven days to recover from the concussion.
"I had a three-day headache and some nausea," Ross said Saturday, per ESPN.com. "It's nice for the seven-day DL where you can take a step back. I think the main concern is just getting another foul ball. I had that happen a couple of years ago, and it put me out about two months. I don't want to go through that again."
Taylor Teagarden was recalled from Triple-A to be the backup catcher in Ross' absence.