Guerrero suffered a torn right pectoral (chest) muscle and has not played since April 15. He's been conditioning and went through an "aggressive workout" before Monday's game in Oakland.
Guerrero is able to work defensively and run the bases.
"We'll take it one step at a time," Scioscia said. "If he feels good doing what he's doing, he'll be getting to swing the bat. We'll see how he responds to that."
The Angels have won 21 of the past 25 games in which Guerrero has hit a home run.
LAA: RHP Shane Loux (1-2, 5.24 ERA)
In his last start, Wednesday's 3-2 win over the Orioles at Camden Yards, Loux went six innings and gave up only five hits and a run -- though he had to work out of trouble early and overhaul his strategy when the sinker wasn't effective. The victory was his first since September 2006, when Loux won for Detroit in Kansas City. A win at Oakland would give Loux his first winning streak in the Major Leagues.
OAK: LHP Dallas Braden (3-2, 2.10 ERA)
Braden won his second straight start on Thursday, pitching five shutout innings against the Rangers' lethal offense. It was a taxing outing, as Braden threw 111 pitches in five innings, averaging right around 22 pitches per inning. In fact, he threw 22 pitches in a pivotal fifth inning, when the Rangers had the bases loaded with one out in a 0-0 game. Braden has allowed two runs or fewer in each of his last four starts. The left-hander has started two games this season when the A's were shut out and left Thursday's game in a scoreless tie.
Infielder Erick Aybar was available for duty on Monday night and will play Tuesday. ... Outfielder Bobby Abreu had hits in his first two at-bats after sitting out Saturday's win in New York and having Sunday's game rained out. ... Right-hander Ervin Santana went 4 2/3 innings in his first rehab assignment with Class A Rancho Cucamonga on Monday night. He allowed three runs on four hits, striking out three with no walks. He gave up two home runs. ... Loux was born in Rapid City, S.D., two years, two months and 24 days after A's infielder Mark Ellis was born in the same city. ... Left-hander Darren Oliver needs three strikeouts for 1,000 in his career.
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Official game notes
KLAA 830, KFWB, KWKW 1330 (Español)
Wednesday: Angels (Anthony Ortega, 0-1, 5.56) vs. Blue Jays (Roy Halladay, 5-1, 3.68), 7:05 p.m. PT
Thursday: Angels (Jered Weaver, 2-1, 3.13) vs. Blue Jays (Robert Ray, 0-0, 4.76), 7:05 p.m. PT
Friday: Angels (Matt Palmer, 2-0, 3.65) vs. Royals (Gil Meche, 2-2, 4.14), 7:05 p.m. PT