The Houston Astros have placed right-handed starting pitcher Bud Norris on the 15-day disabled list with a sprained left knee, reports Brian McTaggart of MLB.com. In a corresponding roster move, Houston called up lefty Dallas Keuchel, who made his major league debut in place of Norris yesterday.

Norris suffered the injury while pitching against the San Francisco Giants last Tuesday. On the year, the 27-year-old maintained an ERA and WHIP of 4.81 and 1.425 over his 13 starts with 10.0 SO/9 and 3.5 BB/9.

Entering the 2012 season, Norris had started 58 games for the Astros over the past two years. After struggling a bit in 2010 (4.92 ERA, 1.484 WHIP, 153 2/3 innings pitched), Norris registered a strong 2011 campaign for the Astros (3.77 ERA, 1.328 WHIP, 186 IP).

Keuchel held the Rangers to one run on four hits with four walks and two strikeouts over five innings during his debut yesterday. Prior to being called up, the 24-year-old posted an ERA and WHIP of 4.26 and 1.257 over his 13 starts for the Astros Triple-A affiliate.