Will Face One of These Guys

EXCLUSIVE

The final 3 candidates to replace Jon Jones at UFC 200 are Gegard Mousasi, Anderson Silva and Dan Henderson -- but there are problems with all 3, especially Henderson ... TMZ Sports has learned.

Our sources say Henderson is a front-runner to fight Michael Bisping for his middleweight title, and that bout is coming up soon -- so moving him to take on Daniel Cormier could screw a potential Bisping match.

Mousasi is already on UFC 200's undercard against Diego Santos. So, moving Gegard would create another hole for Saturday night.

As for Silva -- well, he's old.

We're told the Nevada Athletic Commission requires any fighter over 35 to undergo extensive medical testing and there might not be enough time to get it done for 41-year-old Silva. Plus, as we first reported ... he's also recovering from a recent surgery.