Stephen Strasburg is dealing with a strained flexor mass in his right elbow but his UCL is intact, the Washington Nationals have announced.

Strasburg had an MRI on the elbow Thursday, one day after leaving a start in the third inning. The injury doesn't mean the right-hander's season is over, but there is no timetable for his return.

"I'm thinking let's take care of the swelling and get him to a pain-free range of motion, and then we'll start a strengthening program," trainer Paul Lessard said. "I'm just worried about the next four or five days right now."