Jenks, who has a 37.80 ERA in two spring outings, missed his turn to pitch on Saturday because of irritation. He is scheduled to pitch Monday against Kansas City and vowed to be ready for the opener against Cleveland on April 5.
"No doubt about it," he said on Sunday.
The calf has been an issue for Jenks since last season, when he missed the final 11 games and finished with 29 saves, but he said "regular routines" won't aggravate it.
"Unless I go out there and do something really stupid, its only going to get better," he said. "It was a good report."