Williams claims wing spot Pick your Wales XV

Injuries and the form of Dragons pair Hal Luscombe and Kevin Morgan saw Williams drop down the pecking order.

But he played a full part in Wales' comeback against France after coming on as a replacement at half-time.

"I've had my fingers crossed for the last two weeks, but I'm 100% and raring to go," said the 25-year-old.

"It was a big disappointment to pick up a little injury last week, but I'm very confident and looking forward to playing on Sunday.

"I can't wait to get the ball in my hands and if I get the chances to run at the Scots and take people on."

The Blues wing last started a match for Wales in November against Japan, taking the full-back role in a one-sided 98-0 victory in Cardiff.

The most important thing is that we're winning Rhys Williams

After three impressive wins in this season's Six Nations, there is much talk about a first Grand Slam since 1978 and a first title since 1994, with a home match against Ireland on 19 March being billed as a championship decider.

But Williams, who will win his 42nd cap, warns that Scotland has been a graveyard of other teams' ambitions over the years and must be taken seriously.

"I think this is going to be a huge challenge for us, we all realise how much and how difficult it is going to be to go to Murrayfield and beat them there," Williams added.

"But the self-belief is growing, the confidence is there and the most important thing is that we're winning."

Wales: K Morgan (Dragons); R Williams (Blues), T Shanklin (Blues), G Henson (Ospreys), S Williams (Ospreys); S Jones (Clermont-Auvergne), D Peel (Scarlets); G Jenkins (Blues), M Davies (Gloucester), A Jones (Ospreys), B Cockbain (Ospreys), R Sidoli (Blues), R Jones (Ospreys), M Williams (Blues), M Owen (Dragons, capt).
Replacements: R McBryde (Scarlets), J Yapp (Blues), J Thomas (Ospreys), R Sowden-Taylor (Blues), M Phillips (Scarlets), C Sweeney (Dragons), H Luscombe (Dragons).