HOUSTON (AP) — The Seattle Mariners placed right-hander Taijuan Walker on the disabled list with a lingering problem in his right foot Wednesday, the same day injured ace Felix Hernandez took a big step toward his return from the DL.

Walker left his start on Tuesday night with tendinitis his right foot. It was the third start Walker exited early with the same problem. Manager Scott Servais said the Mariners aren't sure exactly what the plan will be for Walker's recovery, but that he will be visiting a specialist soon.

Hernandez, meanwhile, pitched a simulated game and will soon leave for a rehabilitation assignment. Hernandez has been on the disabled list since June 1 with a strained right calf. He threw 45 pitches to Shawn O'Malley before Wednesday night's game.