Twins first baseman Justin Morneau tried working out today and felt woozy. He said he's probably headed to the 15-day disabled list.

Morneau, who has been out since July 7 with a concussion, said he has felt progressively better in recent days, so he's encouraged. He'll be eligible to come off the DL on July 23.

"Hopefully when it's time to come off, we'll be 100 percent ready to go without there being any questions -- what happens if I dive? what happens if I go in to break up a double play? -- you don't want that," Morneau said. "You want to be able to go out there and play and not have those thoughts and be able to be aggressive."

The Twins plan to activate Matt Tolbert (bruised right middle finger) from the DL on Friday, so he'll likely swap spots with Morneau.

Morneau described what he's feeling as "Fogginess. Things aren't working right. It's not registering right, just walking around. When that's not right, trying hit a 90-mph fastball makes it a little difficult. Just error on the side of caution. See what the plan is. The good thing is it's been getting better every day, and I think we've been handling it the right way, and we've been pretty cautious with it."

Morneau said he'll likely use the new style of protective batting helmet players wore during Tuesday's All-Star Game.

"I don't think it's something that would have really made a difference in this case," he said. "You never really know, but for safety sake I guess we'll try and use that new helmet. It didn't look as bad in the All-Star Game so we'll see how it goes."

NOTES

The White Sox are 25-5 in their past 30 games and riding an eight-game winning streak that has vaulted them into first place.

Kevin Slowey will try to cool down Chicago's offense tonight. Like most Twins starters, Slowey has been markedly better at home, going 5-3 with a 3.54 ERA at Target Field, compared to 3-2 with a 5.98 ERA on the road. Pitching coach Rick Anderson was encouraged by what he saw from Slowey in a two-inning relief appearance Saturday. Slowey retired all six batters he faced and did a good job changing speeds, Anderson said.

Brian Duensing has the flu, and Manager Ron Gardenhire said he'd have to see how he feels during the game.

Clay Condrey is having doctors check his injured right elbow. "Not good," Gardenhire said.

Alexi Casilla has moved up to Class AA New Britain in his rehab from right elbow surgery.

WHITE SOX (49-38)

1. Juan Pierre, LF
2. Omar Vizquel, 3B
3. Alex Rios, CF
4. Paul Konerko, 1B
5. Carlos Quentin, RF
6. Mark Kotsay, DH
7. A.J. Pierzynski, C
8. Alexei Ramirez, SS
9. Gordon Beckham, 2B

Starting pitcher: LH John Danks (8-7, 3.29 ERA)

TWINS (46-42)

1. Denard Span, CF
2. Orlando Hudson, 2B
3. Joe Mauer, C
4. Michael Cuddyer, 1B
5. Jason Kubel, RF
6. Delmon Young, LF
7. Jim Thome, DH
8. J.J. Hardy, SS
9. Nick Punto, 3B

Starting pitcher: RH Kevin Slowey (8-5, 4.74 ERA)

Target Field. First pitch: 7:10 p.m. TV: FSN. Twins Radio Network