Hendriks, who was hospitalized in Baltimore from Saturday to Monday, played catch both days, and said he's in line to throw a bullpen session on Thursday with the hope of starting on Sunday against the Rangers.
"I came in yesterday and did some running and throwing and everything feels good," Hendriks said. "I feel strong. So we'll see what happens from there. I'm throwing a bullpen tomorrow. I've just been playing catch."
The Twins need a fifth starter on Sunday, as they opened the year with a four-man rotation because of an off-day on Tuesday.
Right-hander Anthony Swarzak, who started in Hendriks' place on Sunday, is expected to start on Friday against the Rangers, while right-hander Nick Blackburn will start on Saturday.
Twins manager Ron Gardenhire said the rotation remains in flux, especially considering right-hander Scott Baker will miss the year due to elbow surgery.
"We'll sit down and start writing it all out and figure out who fits where and where everyone is slotted," Gardenhire said. "First, we've got to see what the kid does. He feels pretty good. But he was pretty sick. See how strong he is and go from there."