HERMOSILLO, Mexico -- Doug Davis will not make his next scheduled start because of a left triceps irritation, and the Diamondbacks are unsure when he will return to the mound.

"You don't want to put one of your starters in a position in Spring Training, especially early in Spring Training to try to pitch through it," Diamondbacks manager Bob Melvin said. "Therefore, we will be cautious along those lines."

After his last start Tuesday, the left-handed pitcher revealed that he has had some nerve trouble in his pitching arm for five years and takes a medication called neurontin to treat it. The problem occurs, he explained, when his shoulder muscles get tight and squeeze the nerve.

The veteran was examined by a physician for his aching left side Thursday and will attempt to play catch Monday. It is unclear if the nerve trouble and the triceps problem are related.

Davis will be the second Diamondbacks starter to skip a turn in the rotation.

Last week, the Diamondbacks pushed back the Spring Training debut of ace Brandon Webb because of forearm tightness in his pitching arm. Upon his return, Webb allowed six runs (five earned) on four hits in 1 1/3 innings in an exhibition game against Mexico on Wednesday at Tucson Electric Park.