PHOENIX (AP) — Eduardo Rodríguez's return to the mound is on hold after the Arizona Diamondbacks left-hander felt some “tightness” during a recent bullpen session.

Rodriguez signed an $80 million, four-year deal during the offseason, but he hasn’t pitched yet this season. He was put on the 15-day injured list on March 28 because of a left shoulder strain that happened during spring training.

Coach Torey Lovullo told reporters Friday that “we decided to pull back on his progression. What does that mean, what is the timetable? We're not sure. I don't know what that means right now. I just know that he spoke up, which we've asked our athletes to do, and he felt that tightness."

The D-backs opened a three-game series against the St. Louis Cardinals on Friday.

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