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3/20/2013 1:21 P.M. ET

Halladay's bullpen session yields positive results

CLEARWATER, Fla. -- Roy Halladay threw a bullpen session on Wednesday at Bright House Field, which seemed to go OK.

"Roy threw very well," pitching coach Rich Dubee said through a team spokesman. "He lost almost 10 pounds, so he's just got to gain some weight back and get his strength."

Halladay lasted just one inning Sunday in a Grapefruit League game against the Orioles at Bright House Field because of a stomach virus. He said Tuesday he lost 10 pounds because of the illness and still felt a little weak and jittery.

Halladay is scheduled to pitch in a Minor League Spring Training game Saturday at Carpenter Complex. He would get one more start before he is scheduled to pitch April 3 against the Braves in Atlanta.

The veteran right-hander has had a rough month. Halladay looked fine in his first two Grapefruit League starts, throwing his fastball in the 89-91 mph range. But his velocity has dropped since then. In Halladay's third Grapefruit League start, his velocity fell into the 86-88 mph range, and he talked afterward about experiencing "dead arm." He got roughed up for seven runs over 2 2/3 innings in his fourth start March 12, saying he felt lethargic. Then Halladay lasted just one inning in his fifth start Sunday because of the stomach virus.

The Phillies have said repeatedly that Halladay has no physical issues. They said some of his struggles stem from mechanical issues, which they have been working on.

Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.