Miller was 1-for-21 in the homestand entering Wednesday's game, and a move could be made if the 24-year-old does not turn things around in a hurry. After a solid second half last year and red-hot Spring Training, Miller was hit .156 in the first 35 regular-season games.
The only backup on the current club is veteran utility man Willie Bloomquist, who is hitting .182 and is needed as a backup at all the infield positions.
Asked if his options were limited, McClendon paused.
"As we speak, right now, yeah," he said.
Two options are present with Triple-A Tacoma, however, with Nick Franklin and Chris Taylor splitting time at shortstop and second base and both hitting well.
McClendon has gone the extra mile to get Miller going, however, and he worked with him personally in the batting cage prior to Tuesday's game, with a coach holding a folded towel in front of the plate as McClendon had Miller focus on balls in that area instead of outside the square.
"My point is hitting is hard enough," McClendon said. "The real good hitters make outs seven of 10 times, so to try to get hits on balls outside of the strike zone is going to make it even more difficult. So we're just trying to get a better recognition of the strike zone and where he ought to be looking.
"Right now, everybody has suggestions and everybody wants to help. But in the end, he has to clear his mind, get his focus and do what he does best. And right now that's a struggle for him."
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. Adam Lewis is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.