Walker left Friday's matchup with the Astros after two innings of work due to neck spasms on his left side.
Walker gave up two hits, both for home runs, prior to exiting Friday's contest. It is unclear the severity of the neck spasms, but it was enough to knock him out of the contest. Walker's next projected start is Wednesday against the Rays. Consider him day-do-day until there is an update on his status.