The Los Angeles Dodgers lost starting pitcher Tyler Glasnow to the injured list a week ago due to back spasms. Glasnow left his last start early after warming up before heading back out for the second inning. The injury wasn't expected to be too serious, and Glasnow will be eligible to come off the injured list on May 22. However, Dodgers manager Dave Roberts provided an update on the tall right-hander, saying that he may not return as soon as originally thought. “He’s in the trainer’s room, working on his core, his back,” Roberts said . “He’s just been playing catch so I don’t know what the next step is before throwing off the mound. But I do know we’re going to take our time. I do know that.” Glasnow has been receiving treatment for the back spasms, but it remains uncertain when he will get back. The right-hander hasn't started throwing off a mound yet, which is the first step toward a return. Before the injury, Glasnow had been very good for Los Angeles to open the new season.…