FORT LAUDERDALE — Lionel Messi’s hamstring injury will keep him sidelined for Inter Miami’s home game against New York City FC on Saturday, but he could return for the CONCACAF Champions Cup quarterfinal first leg against Mexico’s Monterrey on April 3. After missing Saturday, Messi will have played in nine of 19 MLS matches since joining Miami last summer. “He is working with the physios,” Miami coach Javier Morales said Friday, “but he won’t be available because we are doing all we can to get him ready for next Wednesday.