Bosch impressed after coming on as a replacement against England © Getty Images

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Matches: Argentina 13 - 12 Scotland

Players/Officials: Marcelo Bosch | Felipe Contepomi

Tournaments/Tours: Rugby World Cup

Teams: Argentina | Scotland

Argentina back Marcelo Bosch is optimistic of success in Sunday's World Cup Pool B clash against Scotland in the Pumas' biggest game since finishing third in the tournament four years' ago.

Following the opening defeat to England, Argentina must beat Scotland at Wellington Regional Stadium in order to progress to the quarter-finals and Bosch is bullish. He said: "I think it will be a really tough game, perhaps our most important match in the past four years - we will think of the match as a final.

"We hope to have a good match and we expect to win, of course."

Biarritz back Bosch was a replacement in the 13-9 loss to England, but was thrust into the action midway through the first half following an injury to captain Felipe Contepomi. He started at centre in the 43-8 win over Romania, a match Contepomi missed due to a rib injury.

Bosch, though, anticipates his skipper will feature against Scotland. The 27-year-old said: "I expect he will be on the field (on Sunday). He is our captain, a very important player for us and I expect the best for him and for us."

Argentina have lost three of the last four meetings with Scotland, including a 2-0 Test series defeat in South America in June 2010. Asked what he expects from Scotland, Bosch said: "I expect they are going to have a bad day on Sunday.

"Seriously, I think they have a very good team and have progressed a lot in the last few years. They keep control of the ball as far as they can. They have a couple of good fly-halves and they are very strong, so I think it's going to be a very tough game.

"The forwards are having a good championship. If they continue in a good way, the backs will follow them. We have to continue in our system of playing, our own strategy and I expect to have a good day."