The Exeter Chiefs boss thinks more could be done to help clubs lower down the rugby pyramid.
The Glasgow forward will lead out the Scots against Georgia on Friday night.
The 67-year-old has decided to speak out in a bid to encourage others suffering from memory loss to seek help.
Seven Wasps players and four backroom staff were diagnosed with Covid-19 ahead of further tests being undertaken on Tuesday.
Johnny Sexton is fit to lead the side at the Aviva Stadium.
Wales have released Williams for Scarlets’ Friday night PRO14 trip to Benetton
Wasps’ place in the showpiece finale had been in doubt after 11 positive coronavirus tests.
Ulster captain Henderson was shown a red card against Ospreys on October 10.
A decision on their participation will come after the results of further tests.
The England scrum-half kicked a drop goal five minutes from the end to secure a thrilling 17-16 victory over Salford.Leeds captain Luke Gale believes the Rhinos’ Coral Challenge Cup triumph