That proved not to be the case on Friday, when Smyly tried to throw off the mound for the first time after resting during the All-Star break.
Smyly said he was fine when he played catch and expected that the issue would subside after a couple days off, as most soreness will. But, once he got on a mound and tried to pull down during his release, the pain returned.
"I was trying to let it go in the bullpen and it hurt really bad, so I had to shut it down," Smyly said. "It's tight, it's really stiff. Just got to wait it out."
With Smyly's stint on the DL retroactive to July 7, he would be eligible to return in time for his next regularly scheduled start.
However, Smyly and Leyland were unable to pinpoint when the lefty might be healthy enough to pitch. After all, they never expected even Tuesday to be an issue.
"I doubt he's going to make his next two starts, but I don't want to say that for sure because we don't know that for sure," Leyland said. "It takes time. Time heals the stuff and that's basically what you get. Talking with the trainers yesterday, all the treatment and everything they get, [he] might be able to progress in about three days, possibly. But there's really no proof of that, either."
"We don't really have a set time," Smyly said. "With all the treatment yesterday, I can feel a little bit of an improvement, but you can't rush it. It's a nagging injury, so you have to make sure it's gone before you can get back out there."
The Tigers have called up Luis Marte from Triple-A Toledo to replace Smyly on the 25-man roster, while Jacob Turner will be called up on Tuesday to start against the Angels, taking Smyly's spot in the rotation.
Leyland said there have not been any conversations between himself and general manager Dave Dombrowski about potentially adding a pitcher from outside the organization.
The timing of Smyly's second DL stint -- he missed time in June due to a blister on his left index finger -- is considered a disappointment. In allowing two runs on six hits in six innings against Kansas City in his last outing, Smyly recorded his first quality start since May 9. He also notched a career-high 10 strikeouts.
Smyly, the only left-hander in the Tigers' rotation, is 4-3 with a 4.42 ERA this season.
"I felt like I was really starting to figure it out, get on a little roll, and then this happens," Smyly said. "But, that's just how it goes sometimes.
"These next couple of days are going to tell a lot, so we'll see then."
Turner made his only other start of the season during Smyly's previous trip to the disabled list, allowing one run on four hits in five innings against the Cardinals.
Turner is 4-2 with a 3.16 ERA in 10 starts for Toledo this season, most recently throwing a complete-game shutout July 7 in Louisville.
Marte has posted a 3.71 ERA in nine relief appearances with the Tigers this season.