An MRI taken of Nationals first baseman Adam LaRoche’s left shoulder showed a slight tear in his rotator cuff, but the injury will not cause LaRoche to miss any games once the regular season begins Thursday, a Nationals source said.

LaRoche has not played since Thursday, sitting out with soreness his shoulder. The Nationals plan for LaRoche to play tomorrow as a designated hitter and Tuesday at first base. LaRoche feels discomfort when he throws, and of course, the fitness of his shoulder will have to be monitored closely. But for now, the injury will not affect LaRoche’s playing status.

Late this week, Manager Jim Riggleman said the Nationals may have to make a small strategic change because of LaRoche’s arm trouble. Rather than LaRoche relaying throws from right field, second baseman Danny Espinosa will serve that role.

UPDATE, 9:42: A Nationals spokesman sent word that the tear is actually a labral tear, not a rotator cuff tear. Also, LaRoche received a cortisone shot in his shoulder, which further explains the time he has sat out.