Halladay, who missed two starts with a sore shoulder, was the starter for Saturday's game against Arizona.
The right-hander entered the game 5-4 with a 3.58 ERA. He was
durable last year, going 22-7 with a 3.25 ERA and leading the
majors with 266 innings.
The Blue Jays also placed right-hander Kerry Ligtenberg on the
15-day disabled list with inflammation in his left hip.