The Baltimore Orioles have placed left-hander Troy Patton on the fifteen-day disabled list with a sprained ankle, reports Brittany Ghiroli of MLB.com:

Patton rolled his right ankle walking to his car in parking garage. Said will only need minimum 15 days on dl

— Brittany Ghiroli (@Britt_Ghiroli) August 14, 2012

To replace Patton on their roster, the Orioles have recalled right-hander Steve Johnson from Triple-A.

Patton rolled his right ankle while he was walking to his car in a parking garage, according to Ghiroli. The 26-year-old has said he only expects to miss the minimum requirement of fifteen days.

Patton has been an important component of Baltimore’s impressive 2012 bullpen. The left-hander has maintained an ERA of 2.58 with 8.3 SO/9 and 1.9 BB/9 over fifty appearances spanning fifty-two and one-third innings.

Johnson made his major league debut with the Orioles earlier this season. The 24-year-old has appeared in two games, including one impressive start in which he held the Seattle Mariners to two runs on five hits and two walks with nine strikeouts over six innings of work.