FILE - In this March 5, 2020, file photo, Sam Narron, left, pitching coach of the Washington Nationals' Double-A Harrisburg Senators, talks with Nationals pitching coach Paul Menhart prior to the Nationals' spring training baseball game against the St. Louis Cardinals in West Palm Beach, Fla. Spring training could be delayed for Double-A and Class A players if major leaguers are not vaccinated for the novel coronavirus by the time big league practice is scheduled to start in mid-February. Major League Baseball, which has taken over operation of the minors, gave notice to minor league teams and big league clubs Monday, Jan. 4.