The Mariners designated Aaron Harang for assignment Monday and that may have opened a rotation spot for Taijuan Walker, The Seattle Times suggests.
Mariners GM Jack Zduriencik hinted last week that Walker may be included in September callups.
For now, nothing seems to be imminent for Walker, who has gone 5-3 with a 3.61 ERA over 11 starts since being promoted to Triple-A Tacoma. He has 64 strikeouts in 57 1/3 innings with Tacoma.