Pavano, whose original MRI exam on May 11 revealed a strain in the front of his right shoulder, has been scuffling as he's tried to pitch through the injury. The right-hander is 1-4 with an 8.25 ERA over his last five starts.
"We need to find out the physical state of the shoulder and everything else," assistant general manager Rob Antony said. "And then we'll sit down with Carl and talk about what we think is the best course of action at that point."
Pavano, who hasn't been on the disabled list since 2008, said he wants to stay in the rotation. He said his shoulder bothers him once he gets around the 60-pitch mark and hasn't been making any real progress in recent weeks.
"We've got to just find out where we're at; this is part of the process," Pavano said. "We've kind of exhausted a lot of things, so when you take steps to remedy something and things kind of stand still, you have to find other answers. So, I think this is just another step in the process."
Pavano said he doesn't think the injury will require surgery. But there remains a chance he'll need extended rest -- as much as six weeks -- for his shoulder to get better. The Twins haven't decided who will replace Pavano in the rotation if he misses his next start on Wednesday.
"I definitely think it's to the point where it's affecting me [and] my pitches," said Pavano, who ranks 11th in the Majors in innings pitched dating back to 2009. "But I feel like it would have got a lot worse if it was something that's going to require surgery or going to be career-threatening. I think it's something that's just weak and irritated and it's causing me discomfort to the point where it's affecting my strength.
"We'll see where it goes, but I'm not too concerned about it being something that will affect me for the rest of the year. There's just a possibility where I have to rest it a little bit and get it back stronger and get that irritation out of there. I think that may be the course we take, but we have to take this next step before making any other decisions."