Williams has been given several chances to impress for the Lions but has yet to steal the show © Getty Images

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Players/Officials: Tommy Bowe | Bryan Habana | Ian McGeechan | Ugo Monye | Shane Williams

Tournaments/Tours: British and Irish Lions tour

Teams: British and Irish Lions | Wales

Shane Williams has been handed one last roll of the dice in his bid to claim a place in the British Irish Lions' Test side.

The IRB World Player of the Year has struggled to find his best form on the Lions' current tour of South Africa and as a result finds himself on the fringes of the Test squad. However, head coach Ian McGeechan has afforded him a final chance to prove his worth by selecting him on the wing for Tuesday night's clash with the Emerging Springboks in Cape Town.

Williams had to watch from the stands as Ugo Monye and Tommy Bowe filled the wing berths for the narrow 1st Test defeat to South Africa in Durban on Saturday and without a try to his name on tour so far the 32-year-old is realistic enough to know anything but a spectacular showing at Newlands will likely see his Lions career come to an end.

"It's my last opportunity, I suppose," said Wales' record international try-scorer. "It is a massive game - it could be my last Lions game ever. I need a big game, I know that, to have any chance of playing in the last two Tests. It is all up to me on the day.

"You come on these tours to play in the Test matches, and I want to play more than anything. I am more determined than ever to be involved. I spoke to (Springboks wing) Bryan (Habana) after the first Test, and told him I was gutted that I wasn't playing. He said 'you never know, I might see you next week'. I have just got to continue training hard and hopefully take my opportunities when they come. It's a last-chance saloon tomorrow."

Williams admits he has found it difficult to make an impact during his previous tour starts against the Royal XV, Cheetahs and Sharks.

"My hands on the ball ratio has been down. Maybe when the ball does come my way, I am trying to look for things to do before I have even touched the ball," he added. "I've found it very difficult to get into the games so far, and no-one is more disappointed than myself, but the tour isn't quite over yet.

"I put the pressure on myself. There is no-one more disappointed than myself at the moment with the way things have gone, so it is up to me to change that."

Williams has not remotely hit the heights of 2008, when apart from landing the International Rugby Board's leading player accolade, he won a Grand Slam with Wales, broke his country's Test try record and was named BBC Wales Sports Personality of the Year.

"I knew it was going to be difficult this year," he said. "The attention seems to be on me constantly, whether it is off the field or on the field. I know I have to deal with that, and hopefully it will make me a better player. I have felt the pressure, I would be lying if I say I hadn't.

"But I would like to think I am a good enough player to hold all that pressure on my back and become a better player from it. I think I have still got a lot more to offer. I was glad when I was mentioned in the starting line-up tomorrow. I want to prove a few people wrong - it's a massive game."

With Monye failing to take two glorious try-scoring opportunities against the Springboks in Durban last Saturday, it has increased pressure on the Harlequins speedster. But Williams refused to put the boot in.

"I am not here to criticise the finishing of the guys on the weekend. I thought Ugo was very unlucky. The first 'try' was a tremendous effort by (Jean) de Villiers to stop him scoring. I was on the other side of the field, and I 100% backed Ugo.

"With the other one, he was unfortunate when he had the ball dislodged from his hand. That's the way it goes sometimes, it has happened to all of us."

Lions head coach Ian McGeechan's line-up for the final midweek game features two props flown in during the past 48 hours.

Ireland Grand Slam winner John Hayes arrived two days ago as replacement for ankle injury victim Euan Murray, but England and Wasps loosehead Tim Payne - summoned as cover for Andrew Sheridan - only touched down today and went straight into training at a Cape Town school.

Fly-half Ronan O'Gara leads the team, making him the Lions' fifth different captain on tour after Paul O'Connell, Brian O'Driscoll, Phil Vickery and Donncha O'Callaghan. Two of the first Test substitutes start - O'Callaghan and flanker Martyn Williams - with four Test starters on the bench in Monye, Vickery, hooker Lee Mears and flanker David Wallace.