Sanchez missed the final two months of the 2014 regular season after his shoulder flared up in August, and missed one month earlier in the season due to a blister.
"It was a weird season," Sanchez said.
The 30-year-old went 8-5 last season with a 3.43 ERA and 102 strikeouts in 126 innings, one year after leading the league with a 2.57 ERA and finishing fourth in the 2013 Cy Young Award voting.
Sanchez told the Free Press he's been throwing for a month and a half and is looking forward to spring training and the 2015 season.
"So far, so good," he said. "Right now, I feel really good. Everything is going fine. I'm not sore or anything."
Sanchez is entering the third year of a five-year, $80 million deal he signed in 2013. Detroit pitchers and catchers report for spring training on Feb. 19.
- Jack Jorgensen