"We have a breakthrough positive involving 3B Coach Phil Nevin, who is fully vaccinated," the Yankees said in a statement. "He is currently under quarantine protocol in Tampa. Under MLB's guidance and advice, and with its assistance, additional testing and contact tracing are ongoing."
Boone also told reporters no other coaches had confirmed positive tests and that he expected the team's game against the Tampa Bay Rays to be played as scheduled Tuesday night. No players were affected, though others were in contact tracing.
Bench coach Carlos Mendoza will take over for Nevin at third, and Mario Garza, who is the team's baseball development coordinator, will coach first. Reggie Willits is the Yankees' usual first base coach in addition to his role as the team's outfield instructor.
Nevin, 50, played 12 years in the major leagues from 1995 to 2006. He was the No. 1 overall pick in the 1992 draft. The ex-CSU Fullerton star posted an .814 OPS and 208 home runs with seven different teams.
He's been coaching since 2008, including three-year stints managing the Triple-A Toledo Mud Hens and Reno Aces. Nevin became the San Francisco Giants' third base coach in 2017 before joining Boone's Yankees staff at the same position for the 2018 season.