If you have a player who is listed as "ready" but his READY is a brownish-yellow color instead of the normal "green", and for a position player he is somewhat over the 110% use, is he OVERUSED or is he READY?

In short, will his performance be affected or is it only if he is listed as OVERUSED that his performance is affected?

I know the manual says the game gradually enforces the 110% usage rule but I don't find an explanation of the color change in the READY.

Thanks for any advice on this [if it is good advice...]