Hernandez got bumped from the starting lineup on Thursday when the Orioles brought up Freddie Bynum after a rehab stint at Double-A Bowie.
He didn't play in that game and wasn't in the starting lineup Friday night. Trembley said that Hernandez would play second base and shortstop most of the time. Hernandez played some second base last season.
"I never think I try to impress somebody else," Hernandez said. "They know what I can do. I'm going to have more chances to play."
It's unlikely he'll get the opportunity to replace Bynum any time soon. In his first start Thursday night, Bynum fielded all eight ground balls hit his way at shortstop and went 2-for-3 at the plate with two singles.
"It's home," Bynum said about playing shortstop, "just like riding a bicycle. I've played it all my life."
Mark Dent is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.