Leonard is Peterborough’s top scorer with eight league goals from 20 League One appearances following his summer move from Blackburn Rovers.
And he has been a major factor in their climb from the foot of the table to 12th place.
“I will do what I think is the most responsible thing to do for Harry first and foremost. If that means he doesn’t play [against Wycombe], I’ve got no problems making that decision,” Williams said.
“If I feel there’s absolutely no risk at all, and there’s no reason for him to be sidelined, he’ll be in contention to play.
“There are markers taken from all the players in a healthy state and they have to be compared after this type of scenario. If the markers are where they were when Harry was without any incident, then it’s deemed he’s back to normal functioning.
“If those markers are off, there’s a need to protect him.”
Looking back on the incident involving a player who has had back problems in the past, Williams described it as “distressing”.
He added: “We have the footage to review back on the bench and there were a few ‘oohs’ from people because they could see the angle his neck was at. It was a very concerning moment, but he’s in a good place now.”
