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The Royal XV are Saturday's opponents in Rustenburg and Williams has underlined the importance of making a strong start.
"Ideally, you would be starting in the Test side and winning the series, but if you don't start, there is still a very important role to play," said Williams.
Game plan"We've got six games before the first Test. We haven't got a season to build a game plan we've just got to hit the ground running.
"Geech (Lions head coach Ian McGeechan) made that point earlier this week.
Experience"He said one of the greatest Lions he ever worked with was Jason Leonard in South Africa 12 years ago.
vast experience and he says he will be looking to make an impact even if he is not selected in the team.
Williams' Lions desire
His one taste of it came as a replacement during the 38 19 third Test defeat against New Zealand in Auckland, which is scant reward for a player with such talent.
Williams faces a fight for the number seven Lions Test shirt with Ireland Grand Slam winner David Wallace, and the contest is launched in earnest this weekend.
The Wales and Cardiff Blues flanker has not yet started a Lions Test match yet despite going on two previous tours to Australia in 2001 and New Zealand four years ago.
"I've been fortunate this season. I've played a fair bit, but not a ridiculous amount.
"And when you turn up in a Lions environment, it gives you an extra boost anyway. It's a Lions tour, and if you are feeling tired on something like that, you shouldn't be here.
and played more than 20 games," Williams said.
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"Jason didn't start, but what he did behind the scenes for the other boys to make sure they won the series was outstanding."
"I think I've played 25 games all season, so I feel quite fresh. The weeks off you have during a season are invaluable.
"I was talking to Gareth Edwards the other day, and he was part of Lions squads that were away for three and a half months Nordstrom Jimmy Choo Womens Shoes
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