Ruiz was removed from Friday's Grapefruit League game against the Nationals due to left side tightness, Christina De Nicola of MLB.com reports.
Ruiz suffered the injury after taking a swing in the third inning and needed assistance making it into the dugout. The speedy outfielder owns just a .446 OPS this spring through 41 plate appearances and already had slim odds of breaking camp with the big club before getting hurt.