Jake Westbrook is scheduled to undergo an MRI on his strained right oblique Monday afternoon. Westbrook suffered the injury near the end of his start Saturday night against the Brewers. He has already been ruled out for his next turn in the starting rotation and could be done for the rest of the regular season if the strain is at all severe. Lance Lynn, Trevor Rosenthal and Shelby Miller are the candidates to fill in for the veteran righty.