Duda was held out of the lineup for the second straight game against the Braves on Sunday.
Duda is hitting .246 with 12 homers and 48 RBI, but his average is just .198 over his last 25 games.
Duda struck out in a pinch-hitting appearance against Craig Kimbrel to end the Mets' 8-7 loss on Saturday. He said the hamstring has bothered him for two weeks.
Collins added that the Mets are hoping left fielder Jason Bay, who's been sidelined with concussion symptoms since June 15, can return to the lineup from a rehab appearance in a couple of days.