SCOTTSDALE, Ariz. -- Colorado Rockies starting pitcher Jhoulys Chacin has no structural damage in his troublesome throwing shoulder, but will remain sidelined for at least another week.

Chacin said Tuesday he wouldn't rule out being ready for opening day, but added the worst-case scenario is he could miss "two or three starts" at the beginning of the regular season as he builds the strength back in his right arm.

"I thought it was in my biceps, but it was more in my shoulder, the inflammation," Chacin said after learning the results of Monday's MRI. "I'm really happy that it's not going to take me too long to get healthy."

Chacin was Colorado's top right-handed starter in 2013, going 14-10 with a 3.47 ERA. But he was limited since the start of spring training and had yet to throw off the mound before he was shut down on Sunday.

"It's going to take a week for me to get the inflammation down and get my strength back," Chacin said. "Then we'll start throwing again."