Williams believes Australian-born Parks, who qualifies for Scotland through his Ayrshire-born maternal grandfather, peformed well enough in the 18-10 over Italy a fortnight ago to keep his place.

We're making a judgement based on what we're seeing in training and in international games which are different than at pro-team level. There are different demands and different pressures, said Williams.

There's not a lot between the two players. Gordon has played some for very good rugby for Leeds and when he gets his opportunity he has to take it.

But obviously we are saying Dan has a wide enough all-round game to merit playing for Scotland.

Dan made the only line break of the game against Italy. We moved 35 metres, got a penalty then kicked three points.

But in international rugby, your number 10s don't make too many line breaks, maybe just one or two.

I had a chat with Gordon and I felt sorry for him. I think we should just allow the young man to play and when his opportunity comes, allow him to take it.

Williams has made only one change from the Italy game for the visit of the in-form Welsh.

Rory Lamont makes his debut on the wing alongside older brother Sean and the 22-year-old Glasgow Rugby player is looking forward to fulfilling the dream of both his mother and himself in what will be a great family day at Murrayfield.

He said: My mum wanted to see Sean and I play for Scotland together and for it to happen is amazing.

I've spoken to both my parents and they're delighted and they will be there to see us.

But it's been a dream for me too, I've reached where I wanted to get to.

I wouldn't say I have caught up with Sean but yet I'm a step closer. He's set the standard for me to get to and it's great to have him here with me.