The official FA guidelines are here... https://www.thefa.com/football-rules-governance/policies/player-registration/points-based-system
It is the "GBE Mens Player Criteria Jan 2021" document. I used it to work out if Zinkernagel would it the 15 points required (when we were supposedly linked with him), my rough sums had him on 10 points. Not sure if Watford got his WP before this came into effect, or if they got an exemption or if I had completely miss calculated.
Not just Roberts (x2) we have had Nmecha, Van le parra, Batth and Morrison all with very few appearances for us.
I guess it will depend on whether the player is a youngster looking for experience, a lad looking to put himself in the shop window or someone they just want off the books.
Redcar R I don't think it is down to the boots. Browne stuck his leg well into the turf with an apparent intention of creating a "solid hip " to lever the player away. We've all done it !
I was quite surprised that he got injured and tended to assume that it was because he'd used his inside leg to make it less obvious.
I've seen a knee go back in again on its own but it is an odd and very upsetting sight to see a knee cap next to where is should be