Maybin left Saturday's game with the injury which he said has been troubling him for a while.
"It feels better," Maybin said. "It was a little more swollen yesterday. I think it could have been from swinging."
Maybin, looking to get extra swings last week in St. Louis, actually took batting practice following a game against the Cardinals and then did so before the game the following day.
"Maybe [I was] overworking it," he said.
Manager Bud Black said Maybin is day to day but didn't think this injury would land him on the 15-day disabled list.
"I think we just have to let it quiet down," Black said.
Maybin was 0-for-2 in Saturday's 9-0 loss to the Mets before he was replaced in the sixth inning by Blake Tekotte.
"I felt it when I did everything yesterday," Maybin said.
Will Venable started in center field on Sunday. Tekotte made the start in right field, his first since joining the team from Triple-A Tucson on May 19.