Coach Dave Wannstedt said he was in no hurry to make a public announcement as to who would start against the Chargers.
Wannstedt said his decision would be based on what he observed from Fiedler during practice. Regardless of how much Fiedler wants to play, Wannstedt said he would make the call.
"It's going to be on me," he said. "Can he function and do what I feel he needs to do to be successful?"
Fiedler played with his knee injury in the latter stages of Sunday's overtime loss to New England, and he's playing through pain in the past as well.
The Dolphins game plan will include plays that both quarterbacks are equally comfortable running.
For his part, Fiedler said it was a little too early to predict whether he'd ready to play on Monday night.
He did say there was no concern that he would aggravate the injury by playing.
"No one has given me reason to have concern about the knee," he said. "I just want to be able to play withouth thinking about it."
Brian Griese, who took all the reps with the first-team offense on Wednesday, said he would ready to go if called upon.
But the official call might not be made until the weekend. Regardless of how it goes, it clearly is one to keep an eye on.