D'Arnaud has been on the disabled list since April 26 with a strained rotator cuff in his right shoulder. He caught seven innings on Saturday with Class A St. Lucie after being limited to designated-hitting duties during the opening four games of his rehab assignment.
D'Arnaud is scheduled to be off Sunday, then catch nine innings on Monday with the Florida State League club. Collins expects d'Arnaud will move to a higher minor-league level later this week in advance of being activated.
Once d'Arnaud is activated from the DL, it seems logical that the Mets will demote Kevin Plawecki to Triple-A Las Vegas and leave veteran Rene Rivera as the major league backup. Plawecki twice popped out in the late innings on Friday with the bases loaded and none out. He enters Sunday's series finale against the Milwaukee Brewers hitting only .204 with one homer and 10 RBIs in 113 at-bats.