Unable to transfer list some players

Hey, I've started a league with Boreham Wood and they have next to know money. Tried to flog some of the higher earning players but I could not put them on the transfer list (It is greyed out). Is there a reason/rule for this?

Both players are also coaches within my team, just in case that has an effect.

And just incase you are wondering their names are Mario Noto and Luke Garrard - Neither of their names came up (and thus couldn't be chosen) when I was selecting a captain for the season either.

Cheers.