D'Arnaud, who turns 30 on Feb. 10, has been on the disabled list in five straight seasons as injuries limited him to 366 major league games, an average of 73 per season.
He was 3-for-15 (.200) with one homer and three RBIs in four games last year before feeling tightness in his right elbow during pregame drills in Miami. He was sent to New York and had an MRI that revealed a torn ulnar collateral ligament.
He had surgery April 17.
Five Mets remain eligible for arbitration and are set to exchange proposed salaries Friday: NL Cy Young Award winner Jacob deGrom, fellow pitchers Noah Syndergaard, Zack Wheeler and Steven Matz, and outfielder Michael Conforto.