NEW YORK (AP) Already stuck in a slump, the Arizona Diamondbacks are going to be without their top pitcher for a while. Diamondbacks ace Zac Gallen was placed on the 15-day injured list Friday because of a strained right hamstring, and the defending National League champions recalled right-hander Slade Cecconi from Triple-A Reno. Cecconi is scheduled to start Daniel Murphy Jersey Saturday against the New York Mets. at Citi Field in the opener of a four-game series. He went back to Arizona on Friday to undergo an MRI and get evaluated by team doctors. Hes going to mi s some time and were going to let him heal up, for sure, Diamondbacks manager Torey Lovullo said after Lovullo said he thought it was a Grade 1 strain, the least severe. Very encouraging, the manager said. Gallen mi sed about two weeks in July 2021 with a Grade 1 strain to his right hamstring. So you can probably overlap that timeline, Lovullo said. Gallen is 5-4 with a 3.12 ERA in 11 starts. The 28-year-old right-hander finished in the top five of NL Cy Young Award voting each of the past two years, including third last season when he went 17-9 with a 3.47 ERA in 210 innings and made his first All-Star team. His injury is the latest blow to a Diamondbacks team that's lost five straight to fall a season-worst seven games under .500. Arizona (25-32) already was mi sing starters Merrill Kelly, sidelined since April 15 by a strained right shoulder, and Eduardo Rodriguez, who hasnt pitched this season because of a strained left shoulder after signing an $80 million, four-year contract as a free agent. It hurts, theres no doubt about it," Lovullo said before Friday night's game. I hated having to pull him off the field. I think everybody felt the same way. But nobody can feel sorry for themselves. Cecconi, 24, was 1-4 with a 6.12 ERA in five starts and one relief appearance for the Diamondbacks earlier this season. He is 1-5 with a 5.31 ERA in 13 major league games (nine starts) all with Arizona over the past two years. Rodriguez is throwing at 75 feet, Lovullo said, and Kelly is scheduled to begin a throwing program next week. All-Star shortstop Geraldo Perdomo (right meniscus tear) was set to play a minor league rehab game Friday in the Arizona Complex League, getting three at-bats as the designated hitter. Right-handed reliever Miguel Castro (right shoulder inflammation) was scheduled to throw from 100 feet. Josh Rogers Jersey