Brian Roberts has been diagnosed with a ruptured tendon in the back of his knee, which sounds really bad but apparently won’t require surgery and will only keep him out for 2-4 weeks, according to Dan Connolly of the Baltimore Sun.

Roberts, who was finally feeling healthy after having his career derailed by multiple concussions, got hurt while stealing second base in the Orioles’ win over the Rays yesterday. At the time it looked like a potentially serious injury and he had to be helped off the field, so 2-4 weeks qualifies as somewhat good news.

Roberts hasn’t been healthy and effective since 2009, but hit .310 this spring and was off to a nice 5-for-12 start before the injury. Ryan Flaherty and Alexi Casilla will fill in at second base.