As per MLBTR:
The Padres will shut starting pitcher Josh Johnson down for 10 days to two weeks with a strained flexor, Dennis Lin of the San Diego Union-Tribune tweets. Johnson will be out for at least four weeks. It must be a frustrating injury for Johnson, who only started 16 games last season. While the injury doesn’t appear to threaten a huge portion of the season, the Padres can feel grateful for an option they built into Johnson’s contract — if Johnson starts fewer than seven games this season, the Padres get a $4MM option on his services for 2015.
QUICK REACTION: I was one of a few that thought it best to just roll the dice and bring JJ back for another go around in the Blue Jays rotation. This is already a tough start for the oft-injured right handed starting pitcher.