Let's hope that's all it is. For what it's worth, Jonathan Papelbon was also scratched for Sunday's game with an illness.
Halladay struggled with velocity and complained he felt "lethargic" after allowing seven runs in 2.2 innings vs. the Tigers.
On Sunday, he threw 27 pitches in the first inning and faced five batters without allowing a run. A scout told CSNPhilly.com's Jim Salisbury that Halladay was efforting to reach 85-88 mph with his fastball.
He walked another batter, which has become a troublesome trend for Doc as he's worked to right himself this spring. He has seven walks in 12 innings.
Halladay only has the opportunity for two more starts this spring.
Shaping the bullpen
The cuts of Jake Diekman, Justin De Fratus and Cesar Jimenez leave seven relievers in the battle for the Phillies' final three bullpen spots.
If Phillippe Aumont has one spot locked up, as it has appeared this spring, it means lefties Raul Valdes and Jeremy Horst and righties Mike Stutes, Aaron Cook, Rodrigo Lopez and Zach Miner are fighting for the last two.
With all of the concern over Halladay and the chance that he isn't ready to go by the time the season starts, it's safe to assume Cook has the inside track to the 'pen as a longman and insurance policy. It would then likely come down to Horst or Valdes for that final job as a second lefty. Both were successful with the Phils last season, though Horst has struggled mightily this spring, allowing four homers and eight runs in 8.1 innings. Valdes has also been taken deep four times this spring, but he has 16 strikeouts to just one walk.