Manager Lloyd McClendon said Seager was getting a day off and would be back in the Mariners' lineup Friday against the White Sox. Seager, 27, is hitting .254 with 18 home runs and 49 RBIs, but is batting just .196 in August.
''He deserves (a day off) every now and then,'' McClendon said.
Seager said he was fine physically.
Brad Miller was batting eighth and playing third base for Seattle.
The 38-year-old Rodney had been designated for assignment by Seattle last Sunday.
Rodney was 5-5 and had gone 16 for 22 in save chances this season. The right-hander had a 5.68 ERA in 54 games.