The 32-year-old Wales and Ospreys wing will report for duty at the Lions' Surrey training base, where preparations are set to begin in earnest ahead of departure next Sunday.

An in-form Williams could prove a Lions match-winner as the tourists look to emulate their 1997 Test series triumph against world champions South Africa.

After some mixed experiences in New Zealand four years ago - Williams scored a Lions record-equalling five tries in one game, but featured in just one Test - he is determined to make the most of this latest opportunity.

"I would like to think I am a little more experienced now, and that I can go on this tour and be very successful, both team-wise and personally," he said.

"I think the grounds suit me in South Africa. It will be my last Lions tour, and I would like to go out with a bang and be part of something really special.

"They are a very physical side - from numbers one to 15 - but what you find with South Africa is they are very structurally sound.

"They have a very good lineout and scrum, which means they don't lose much ball and they win quite a lot of the opposition's, and they have got a lot of pace behind the scrum, with some of the deadliest finishers around."

Williams' 46 tries in 65 Tests for Wales make him a dangerous proposition for the Springboks, should he gain Test selection.

"Gone are the days now, when I think I can take on the world every time I get the ball. That's not going to be the case," Williams added.

"Sometimes in games I am marked by two players. That's fine, it just means I have got to tweak my game slightly to create space for others, which is what I am trying to do.

"Rugby is not just a physical game. Believe it or not, rugby players do have to think on their feet as well!

"I've had a few niggling injuries that I've had to adjust to, but I would like to think I have come into some good form and I am creating some space for others, as well as myself.

"I am excited about this tour, which is a good sign for me. If you are enjoying yourself, then you play good rugby."

Leicester and Leinster players apart - they are involved in next Saturday's Heineken Cup final at Murrayfield - the majority of head coach Ian McGeechan's squad are due to report at Bagshot.

The group will include Scotland skipper Mike Blair, who was called up as replacement for injured Ireland scrum-half Tomas O'Leary, but McGeechan has not yet made any further announcements.

Munster flanker Alan Quinlan, who has just started serving a 12-week ban after making contact with the eye area of Leinster captain Leo Cullen during a Heineken Cup semi-final earlier this month, is set to miss the tour.